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OpenStudy (anonymous):
In the middle of a round pool lies a beautiful water-lily. The water-lily doubles in area every day. After exactly 20 days the complete pool will be covered by the lily. After how many days will half of the pool be covered by the lily?
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OpenStudy (anonymous):
19
OpenStudy (akshay_budhkar):
yaa! 19 is right!! I believe it is.. It rises exponentially
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