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20 December, 14:41

Worm is at the bottom of a 12-foot wall. Everyday the worm crawls up 3 feet, but at night it slips down 2 feet. How many days does it take the worm to get to the top of the wall?

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  1. 20 December, 14:43
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    The worm will take 10 days to get to the top of the wall.

    Step-by-step explanation:

    Worm is at the bottom of a 12 foot wall.

    Worm crawls up the distance = 3 feet per day

    and slips down the distance = 2 feet per day

    Everyday it crawls up by the distance = 3 - 2 = 1 feet

    Time taken to crawl up to the height 9 feet = 9 days [ Since it crawls up 1 feet per day]

    Remaining distance after 9 days = 12 - 9 = 3 feet

    Now on the 10th day worm will crawl up by 3 feet of the distance remaining.

    Hence the worm will take 10 days to get to the top of the wall.
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