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The snail gains 1 foot every day, but the day it reaches 25 ft (at the start of the day) is the day it will reach the top. So it needs to have reached 29 ft at the end of the previous day

You can work out a series for the progress: at the end of day 1 it gets to 5ft, at the end of day 2 to 6ft, at the end of day 3 to 7ft, and so on . Thus at the end of the nth day it will reach height (n + 4)ft. At the end of the 25th day it will reach 29ft, so at the end of day 26 it will reach 30 ft.

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15y ago
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15y ago

28. The last day only climbs

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Q: In one of the big halls you see a snail who is climbing up. He manages to crawl up the wall 3 feet each day?
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