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== 27 days. The lilypad doubles in size in one day, so one day ago it was half the size it is now. If today it covers the entire pond, yesterday it covered half the pond. Since today is day 28, yesterday is day 27.

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Q: A lilypad doubles in size each day In 28 days the lilypad will cover the entire pond In how many days will the pond be half covered?
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