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Math and Arithmetic
Slugs and Snails

A snail climbs up the wall 20 feet high Each day it climb 5 feet but at night it slips backward 4 feet How many day it take for the snail to get to the top of the wall?


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April 29, 2010 9:15PM

20 Days sounds like the obvious answer

16 days is the correct answer. The snail can go 5 feet each day... and slides back 4 each night. He will get to the 19th foot on the 15th DAY but will slide back to the 15 foot mark on the 15th NIGHT. He will climb 5 feet on the 16th day, reaching the 20 foot mark.