John, Leslie, Michael, and Patrick weigh 56Kg, 59Kg, 62Kg and 120Kg respectively. They want to cross a river using a boat with a capacity of 120Kg. Find a way to get all of them across the river with the minimum number of rows. You must show your rows using the most suitable notations from the
lecture notes (Unit 2).
Answers
Given : John, Leslie, Michael, and Patrick weigh 56Kg, 59Kg, 62Kg and 120Kg respectively.
They want to cross a river using a boat with a capacity of 120Kg.
To Find : a way to get all of them across the river with the minimum number of rows.
Solution:
56 + 59 = 115 kg
56 + 62 = 118 kg
only combination less that 120 kg
This side Other side
56 , 59 , 62 , 120 -
62 , 120 → 56 , 59
59 , 62 , 120 ← 56
56 , 62 → 120 , 59
56 , 62 , 59 ← 120
59 → 120 , 56 , 62
56 , 69 ← 120 , 62
→ 120 , 62 , 56 , 59
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