Four people want to cross the river. There is only one boat available, and it can carry a maximum of 200 pounds. The weight of the four people are 109,170,110, and 90 pounds. How can they all manage to get across the river, and what is the minimum number of crossing required for the boat?

QUESTION POSTED AT 01/06/2020 - 03:54 PM

Answered by admin AT 01/06/2020 - 03:54 PM

1.  (90 + 109) →→→→  [109 stays, 90 goes back]
2.  
←←←←←←(90)← 
3. (90 + 110) →→→→   [110 stays, 90 goes back and stays there]
4. ←←←←←←(90)←   
5. (170)→→→→→→     [170 stays, 110 (оr 109) goes back]
6. ←←←←←(110)←     
7. (110+90)→→→→→  [done]


I hope this helps :)
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