THE BOTANY CONUNDRUM

A giant water-lily grows at Kew Gardens, and doubles its size every day. It takes 32 days to cover the whole pond. How many days does it take to cover just one-quarter of the pond?

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30. On Day 31 it doubles from 1/4 to 1/2 the pond, and on day 32 from 1/2 to the whole pond.

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