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Water lilies growing on a pond double their surface area coverage each day. It took 40 days for the water lilies to cover half of the pond. How long will it take for the lilies to cover the entire pond?

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Water lilies growing on a pond double their surface area coverage each day. It took 40 days for the water lilies to cover half of the pond. How long will it take for the lilies to cover the entire pond?

41 days

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um...duh? 40 days, half, and one day to double. 41 days. (so close to 42!)

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