Câu hỏi:
Lily is a lillypad in a small pond. Lilly doubles her size each day, On the 20th day she cover the whole pond. On what day was Lily half the size of the pond?
Đáp án:
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.
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