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There were two twins. One of them was sleeping 8 hours a day, and the other one was sleeping 6 hours a day, every day.
They were living like this until they turned 72 years old.
How many years did each of them spend sleeping?

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Answer: 24 and 18 years.
The first one was sleeping 8 hours a day, so he was sleeping 1/3 of his life, so in total he was sleeping 72/3 = 24 years.
The second one was sleeping 6 hours a day, so he was sleeping 1/4 of his life, so in total he was sleeping 72/4 = 18 years.

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