The lily Pad
Level
pending
A lily pad sits in a pond. Every day the liliy pad grows twice it's size. On the 24th day the lily pad covers the entire pond, on what day did it cover half the pond?
The answer is 23.
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1 solution
If the lily pad covers an area A one day, then it covered area 2 A the day before. Therefore a completely covered pond on day 24 means a half-covered pond on day 23.