How can I work out 30% of (blank) is 60?

QUESTION POSTED AT 14/12/2019 - 05:10 PM

Answered by admin AT 14/12/2019 - 05:10 PM

X= 60*100 /30
=600/3= 200 

check
200*30/100=60
Post your answer

Related questions

Andrew believes the honor roll students at his school have an unfair advantage in being assigned to the math class they request. He asked 500 students at his school the following questions: "Are you on the honor roll?" and "Did you get the math class you requested?" The results are shown in the table below: Help Andrew determine if all students at his school have an equal opportunity to get the math class they requested. Show your work and explain your process for determining the fairness of the class assignment process.

                                                            Honor roll Not on honor roll Total
Received math class requested        315               64                   379
Did not get math class requested        41               80                   121
Total                                                        356             144                   500 

Honor roll: request granted: 315/356 = 0.88 x 100% = 88%
Not Honor roll request granted: 64/144 = 0.44 x 100% = 44%

Honor roll students were given preference in granting request than those not in the honor roll.

ANSWERED AT 18/01/2020 - 07:39 AM


QUESTION POSTED AT 18/01/2020 - 07:39 AM

What value of a makes the equation true 18/60=12/a a 30 b 4 c 20 d 40

The answer is d 40
by applying the cross product

ANSWERED AT 18/01/2020 - 07:16 AM


QUESTION POSTED AT 18/01/2020 - 07:16 AM

Georgianna wants to use the linear model associated with the data in the table to make a prediction. Which range of time values describes the entire interval over which she would be interpolating? A) 0 to 5 minutes B) 0 to 18 minutes C) 0 to 30 minutes D) 18 to 30 minutes

the data in the table in the attached figure

we know that

Linear model regression is used to predict the relationship between 2 variables by fitting the observed data in a linear equation.  

The range of time values that describes the interpolation that Georgianna would be making is from

 0  to  30  minutes

Because

the minimum value of the time of the data in the table is equal to  0 minutes

the maximum value of the time of the data in the table is equal to  30 minutes

therefore

the answer is the option

 C) 0 to 30 minutes

ANSWERED AT 18/01/2020 - 07:12 AM


QUESTION POSTED AT 18/01/2020 - 07:12 AM

A cell phone company offers a basic monthly plan that charges $20 for the first 60 minutes and $0.05 per additional minute. If you budgeted $60 to spend on your cell phone bill for the month, how many minutes can you use? 860

A cell phone company offers a basic monthly plan that charges $20 for the first 60 minutes and $0.05 per additional minute.
 Now, you budgeted $60 to spendon your cell phone bill for the month.
 Let's find out how many minutes can you use? 
=> 20 dollars + 0.05 (n), where n is the number of minutes.
=> 60 dollars - 20 dollars = 40 dollars
=> 40 dollars / 0.05 = 800 minutes
=> 20 dollars + 0.05(800) = 
=> 20 + 40 = 60 dollars = 60 minutes + 800 minutes = 860 minutes. 

ANSWERED AT 18/01/2020 - 06:55 AM


QUESTION POSTED AT 18/01/2020 - 06:55 AM

Emma earns $6 each time she mows the lawn and $8 per hour for babysitting. She is saving up to buy a new pair of jeans that cost $48. If she mows the lawn x times and babysits for y hours, which graph shows the amount of work she needs to complete to earn at least enough to purchase the new jeans?

To graph this we find the x- and y-intercepts. The x-intercept would be at 8 and the y-intercept would be at 6.

Explanation:
The equation is 6x+8y=48. An x-intercept is the point where the data crosses the x-axis. All points on this line will have a y-coordinate of 0, so we replace y with 0 and solve:
6x+8(0)=48
6x=48.

Divide both sides by 6:
6x/6=48/6
x=8.
We go to 8 on the x-axis and plot the point.

A y-intercept is the point where the data crosses the y-axis. All points on this line will have an x-coordinate of 9, so we replace x with 0 and solve: 6(0)+8y=48
0+8y=48
8y=48.

Divide both sides by 8:
8y/8 = 48/8
y=6.

We go up to 6 on the y-axis and plot the point. We then draw a line through these two points.

ANSWERED AT 18/01/2020 - 06:51 AM


QUESTION POSTED AT 18/01/2020 - 06:51 AM

To earn extra money, martin works part-time in a butcher's shop. in a particular week during the school holidays he worked twice as many hours on tuesday as he did on monday but only 3/4 the hours on wednesday compared to monday. for these 3 days he received $127.50. if he is paid $8.50 per hour, how many hours did martin work on monday?

X = monday
2x = tuesday
3/4 x = wednesday

8.50x + 8.5(2x) + 8.5(3/4x) = 127.50
8.50x + 17x + 6.375x = 127.50
31.875x = 127.50
x = 127.50 / 31.875
x = 4

Martin worked for 4 hours on Monday.

ANSWERED AT 18/01/2020 - 06:50 AM


QUESTION POSTED AT 18/01/2020 - 06:50 AM

Four more than three times a number, is less than 30. Which of the following is not a solution? 6 12 8 7

Answer:

12

Step-by-step explanation:

ANSWERED AT 18/01/2020 - 06:43 AM


QUESTION POSTED AT 18/01/2020 - 06:43 AM

Five times a number is the same as 30 more than 8 times the number. Find the number. If n is "the number," which equation could be used to solve for the number? 3n = 30 5n + 8n = 30 5n = 8n + 30

Answer:  the correct option is

(C) 5n=8n+30.

Step-by-step explanation:  Given that five times a number is the same as 30 more than 8 times the number.

We are to find the number.

Also, if the number is denoted by n, then we are to select the equation that could be used to solve for the number.

Since n is the given number, so five times the number is written as

5\times n=5n.

Also, 30 more than eight times the number is written as

8\times n+30=8n+30.

Since both the expressions are same, so we get

5n=8n+30\\\\\Rightarrow 8n-5n=-30\\\\\Rightarrow 3n=-30\\\\\Rightarrow n=-\dfrac{30}{3}\\\\\Rightarrow n=-10.

Thus, the required number is -10 and the the equation that is used to solve for the number is 5n=8n+30.

Option (C) is CORRECT.

ANSWERED AT 18/01/2020 - 06:39 AM


QUESTION POSTED AT 18/01/2020 - 06:39 AM

Melinda and Paul shovel driveways and sidewalks in the winter as a way to earn extra money. Together they shoveled 450 square feet of sidewalk in 30 minutes. Then Melinda shoveled for 20 minutes while Paul shoveled for 25 minutes to complete 345 square feet of driveway. 30x + 30y = 450 20x + 25y = 345 How much more can Paul shovel in 1 minute than Melinda? 3 square feet per minute 6 square feet per minute 9 square feet per minute 15 square feet per minute

Answer: Hello mate!

we have the system of equations

30x + 30y = 450

20x + 25y = 345

where x is the number of square feet of snow that Melinda shovels in one minute, and y is the number of square feet of snow that Paul shovels in one minute.

Let's solve the system of equations, first, isolate one of the therms in the first equation, for example, x.

30x+30y = 450

x + y = 450/30 = 15

x = 15 - y

now we can replace it in the second equation and solve it for y.

20x + 25y = 345

20(15 - y) + 25y = 345

300 - 20y + 25y = 345

5y = 45

y = 45/5 = 9

Paul can shovel 9 square feets of snow in one minute, now replace it in the first equation and solve it for x.

x + y = 450/30 = 15

x + 9 = 15

x = 15 - 9 = 6

so melinda sholves 6 square feet of snow in one minute.

The question is:

How much more can Paul shovel in 1 minute than Melinda?

We need to see the difference y - x = 9 - 6 = 3

this means that paul shovels 3 more square feet per minute than Melinda.

ANSWERED AT 18/01/2020 - 06:36 AM


QUESTION POSTED AT 18/01/2020 - 06:36 AM

Tom earned £173 last week and he worked for 25 hours. how much does he earn?

TOm earned 173 dollars Last week working for 25 hours.
Now, if you're asking about his earnings, it's 173 dollars.
But if you're asking about his hourly rate.Let's find out:
=> 173 / 25 = 6.92 dollars per hour.

ANSWERED AT 18/01/2020 - 06:35 AM


QUESTION POSTED AT 18/01/2020 - 06:35 AM

In Juneau, Alaska, the 30-year annual snowfall average is 86.7 inches with a standard deviation of 40.4 inches. The last four years saw an average annual snowfall of 115.7 inches, 62.9 inches, 168.5 inches, and 135.7 inches. Hia performs a hypothesis test on this data to determine if the next 30-year norm will have a different average if the trend from the last four years continues. She uses a significance level of 5%. Which of the following is a conclusion that she may make? a) The z-statistic is 1.44, so the null hypothesis cannot be rejected. b) he z-statistic is 1.68, so the null hypothesis cannot be rejected. c) The z-statistic is 1.85, so the null hypothesis should be rejected. d) The z-statistic is 4.6, so the null hypothesis should be rejected.

The expected value of the amount of average snowfall for over 30 years is 86.7 inches with a standard deviation of 40.4 inches. To verify if this particular trend continues, we must check the significance value of the amount snowfall for the past four years. Given that the snowfall for past years are as follows: 115.7 inches, 62.9 inches, 168.5 inches, and 135.7 inches. Thus the mean of the sample would be: (115.7 + 62.9 + 168.5 + 135.7)/4 = 120.7 inches. To compute for the z-score, we have z-score = (x – μ) / (σ / √n) where x is the computed/measured value, μ is the expected mean, σ is the standard deviation, and n is the number of samples. Using the information we have, z-score (z) = (120.7 - 86.7) / (40.4/ √4) = 1.68 In order to reject the null hyptohesis our probability value must be less than the significance level of 5%. For our case, since z = 1.68, P-value = 0.093 > 0.05. Therefore, the answer is B.

ANSWERED AT 18/01/2020 - 06:35 AM


QUESTION POSTED AT 18/01/2020 - 06:35 AM

The data represent the ages of people working at a store. 20, 30, 22, 29, 24, 27, 33, 25, 21, 19, 23 What is the first quartile of these ages? A. 19 B. 29 C. 21 D. 20

First, arrange the data from lowest to highest
19, 20, 21, 22, 23, 24, 25, 27, 29, 30, 33

Next, find the media or the middle data.
The median is 24.
19, 20, 21, 22, 23, 24 (median), 25, 27, 29, 30, 33

Lastly, look at the data below the median and find the middle of those data. If it's between two numbers, choose the lower number. That's the first quartile.
The first quartile is 21.
19, 20, 21(Q1), 22, 23, 24 (median), 25, 27, 29, 30, 33

ANSWERED AT 18/01/2020 - 06:32 AM


QUESTION POSTED AT 18/01/2020 - 06:32 AM

The table below shows data from a survey about the amount of time, in hours, high school students spent reading and the amount of time spent watching videos each week (without reading): Reading Video 3 1 3 2 4 3 5 4 6 6 7 7 10 8 12 8 14 9 30 15 Which response best describes outliers in these data sets? A, Reading has a suspected outlier in the 30-hour value. B. Reading has a suspected outlier in the 30-hour value, and video has a possible outlier in the 15-hour value. C. Neither data set has suspected outliers. D. The range of data is too small to identify outliers.

Answer:

The correct option is: A,B

Step-by-step explanation:

" An outlier is a odd value which on removing from the data leads to the less mean as calculated mean on including that value ".

There are total 10 data points.

  • The table for reading is given as:

3    3    4    5    6     7    10    12    14    30

The mean of this data is given by:

\dfrac{3+3+4+5+6+7+10+12+14+30}{10}=\dfrac{94}{10}=9.4

Also the mean after omitting the odd value i.e. 30 we get:

\dfrac{3+3+4+5+6+7+10+12+14}{9}=\dfrac{64}{9}=7.11

Hence, there is a change in its mean;

Hence the outlier for reading is 30.

  • The table for Video is given by:

1     2     3    4    6    7      8    8     9    15

The possible maximum value here is 15 so we will check whether it is an outlier or not.

The mean of this data is given by:

\dfrac{1+2+3+4+6+7+8+8+9+15}{10}=\dfrac{63}{10}=6.3

Also the mean after omitting the odd value i.e. 15 we get:

\dfrac{1+2+3+4+6+7+8+8+9}{9}=\dfrac{48}{9}=5.33

Hence, there is a change in its mean hence 15 is an outlier.

Hence option A and B are true.



ANSWERED AT 18/01/2020 - 06:31 AM


QUESTION POSTED AT 18/01/2020 - 06:31 AM

4. Contractor 3 gives Mrs. Solar the following fee table showing his charges for the contract work. Number of hours Total cost 2 $120 3 $180 4 $240 5 $300 (a) What is the rate of change? What does this mean in a real-world context? (b) What is the y-intercept? What does this mean in a real-world context? (c) Write an equation to represent the total cost, y, given x hours.

PART A:
The rate of change can be found by taking the total cost divided by the number of hours. It's essentially the "slope" of the line.
$120/2 = $60/hour

In the real world, that just means the contractor charges $60 for each hour of work.

PART B:
If you graph the points, it's obvious the y-intercept is 0.

In the real world, that just means the cost is $0 when the contractor does 0 hours of work.

PART C:
The general form of a line (slope-intercept) is:
y = mx + b

We already figured out the slope (m) and the y-intercept (b) in the first two parts, so just plug them in:
y = 60x + 0

We can just drop the last part about adding 0, so the simple equation is:
y = 60x

PART D:
Just plot the points and connect them with a line.

ANSWERED AT 18/01/2020 - 06:28 AM


QUESTION POSTED AT 18/01/2020 - 06:28 AM

24 songs to 78 songs, find the percent in change, I had tried to work it out and i got 30% but its wrong

78 * ( x/100) = 24 78 * x = 24 * 100 78 * x = 2400 X = 2400/28 X = 400/13 X = 30.77% The percent is 30.77

ANSWERED AT 18/01/2020 - 06:24 AM


QUESTION POSTED AT 18/01/2020 - 06:24 AM

At a factory, a mechanic earns $17.25 an hour. The president of the company earns 6 3/4 times as much for each hour he works. The janitor at the same company earns 3/4 as much as the mechanic. How much does the company pay for all three people employees' wages for one hour of work?

Find how much each earns

pres =6 and 3/4 times mec pay=17.25 times 6.75=116.4375, about $116.44
janitor is 3/4 or 0.75 of janitor=17.25 times 0.75=12.9375, about $12.94

add them

$17.25+$116.4275+$12.9375=146.615
round
$146.62

ANSWERED AT 18/01/2020 - 06:14 AM


QUESTION POSTED AT 18/01/2020 - 06:14 AM

Three students are preparing information packets about an upcoming fundraiser event. • Lauren prepared 270 packets in 45 min. • Hannah prepared 450 packets in 1.5 h. • Jakob prepared 280 packets in 1 h and 10 min. Who worked the fastest? A. Lauren B. Hannah C. Jakob D. they all worked the same rate

Rate=amountdone/time

convert everybody to minutes
1 hour=60 minutes
45 mins=45 mins
1.5 hour=1.5 times 60=90mins
1hour and 10mins=60+10=70mins

laurenrate= 270packets/45mins=6ppm (packets per minute)
hannahrate=450packets/90mins=5ppm
jakobrate=280packets/70mins4ppm


whoever worked the fastest, has the highest ppm

lauren is winner


answer is A. lauren

ANSWERED AT 18/01/2020 - 06:13 AM


QUESTION POSTED AT 18/01/2020 - 06:13 AM

Question 16 add both numbers at end Show work because I don't get it thank you

Ok, so yo know what a net is? (not like fishing) like when you unfold the shape

ok so

the left side box surface area is
SA=2(LW+LH+WH)
SA=2(35*12.5+35*32.5+12.5*32.5)
SA=2(437.5+1137.5+406.25)
SA=2(1981.25)
SA=3962.5 cm^2

the right shape (triangular psism)
has 2 triangles and 3 rectangles
SA=2(1/2bh)+2(slantheight times side)+bh
SA=(23 times 20.5)+2(23.5 times 12.5)+(23 times 12.5)
SA=471.5+2(293.75)+287.5
SA=759+595.5
SA=1346.5

box=3962.5 cm^2
trianglar ting=1346.5 cm^2
how much more
box-triangle=3962.5-1346.5=2616 cm^2 more

ANSWERED AT 18/01/2020 - 06:09 AM


QUESTION POSTED AT 18/01/2020 - 06:09 AM

Tanisha's potato salad recipe calls for 3pounds of potatoes.She decides to make 3.5 times her regular recipe. How manpounds of potatoes should Tanisha buy? Show your work.

What i did was multiply 3.5 and 3 and got 10.5
so your answer will be 10.5

ANSWERED AT 18/01/2020 - 06:09 AM


QUESTION POSTED AT 18/01/2020 - 06:09 AM

The probability of winning a game is 40%. You play 60 times. How many times do you expect win? PLZZZZZ HELP MEEE!!!!

If the probability of winning a game is 40%, then chances are, you will win 40 times out of 100, given that % is out of 100.

40/100 = x/60.
x=24

Or, you can just find 40% of 100. Since "of" signals multiplication, you can multiply 0.4 by 100.

ANSWERED AT 18/01/2020 - 06:07 AM


QUESTION POSTED AT 18/01/2020 - 06:07 AM

Can u plz find surface area Don't get it so can u plz show your work thank you

Think of finding each surface area as finding the area of a 2D object

Lets start with the triangle.

area of right triangle = ab/2

6*8=48  48/2= 24

so the triangles surface area is 24, remeber there are 2 identical triangles so multiply 24 by 2 and get 48 again

now lets do one of the rectangles

area of rectangle is ab

so 4*10=40

lets add that to the total

48+40 = 88

Now lets do 8*4= 32

add to total again, 88+32= 120

and now do the last rectangle, 6*4=24

Now get the grand total of it all, 120+24 = 144

Thats how you do it :)

ANSWERED AT 18/01/2020 - 06:06 AM


QUESTION POSTED AT 18/01/2020 - 06:06 AM

Divide. Show your work.

I stopped after 3 decimals, but the answer I got was 301.176

ANSWERED AT 18/01/2020 - 06:04 AM


QUESTION POSTED AT 18/01/2020 - 06:04 AM