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The humorous answer is to say "there aren't two lily pads in the pond, only one." The mathematical answer is that identical lily pads would take 29 days to fill the pond (not 15), because after the first day, a single lily pad would be twice its size, or the same size as the set of two would be to start out.

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Q: If there's one lily pad in a pond and it doubles its size each day and it takes 30 days for the pond to fill up how long will it take for two lily pads to fill up the pond?
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