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Lily is a lilypad


Riddle

Lily is a lilypad in a small pond. Lilly doubles her size each day, On the 20th day she covers the whole pond. On what day was Lily half the size of the pond?

Answer

Day 19, it's not 10 because on day 20 she doubled from day 19, so 19 must be half the size of the pond.

Topic: interview
Author: riddles.com
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