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A small airplane carrying 3 men has to make an emergency landing in the middle of the desert. The men decide that their best chance for survival is for each of them to set out across the desert in a different direction. in the hope that one of them will be able to reach civilization and get help for the others. Their supplies include 5 full bottles of water, 5 half-full, and 5 empty bottles.
Since water-carrying capacity is important should a man reach an oasis, they wish to divide both the water supply and the number of bottles equally among themselves. How can they achieve this?
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Each man will have: 2 full bottles, 1 half-bottle, and 2 empty bottles. Reasoning: There is enough water for 7 1/2 full bottles. There are 15 bottles altogether. Therefore each man will end up with 2 1/2 full bottles and 2 1/2 empty bottles. However, half an empty bottle is the same as half a full bottle, leading to the above result.