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Difficulty: EasyPuzzle Details

A lily pad starts in the middle of a pond on day 1, overnight it doubles in size. This happens every night. If the pond is covered on day 10, how big was the lily pad on day 9?

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[Ref: ZTCD]  

Answer: 1/2 the size of the pond.

This is easiest to see by working backwards. On day 10 the pond is covered, so during the previous night it doubled in size.


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