Question 201733
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12 feet 6 inches is 150 inches.  Each day the snail manages a net 7 inches.  150 divided by 7 = 21 remainder 3.  The morning of the 20th day, the snail will be at 19 times 7 =  133 inches.  That day he will reach 143 inches and go back to 140 that night, so the morning of the 21st day it will be at 140.  That day he will reach 150 and be out so he won't slip back again.  21 days.



John
*[tex \LARGE e^{i\pi} + 1 = 0]
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