Water+Lily+Problem

Consider the following:
Water lilies double the area they cover every 24 hours. At the beginning of the summer there is one water lily on a pond. It takes 60 days for the pond to become covered with water lilies.

Answer the following questions:
On what day is the pond half covered? ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ =References:= For more about working backward see Gen Psych, Chapter 7

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