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Monday, July 28, 2008

Growing Water-Lily

In the middle of a round pool lies a beautiful water-lily. The water-lily doubles in size every day. After exactly 20 days the complete pool will be covered by the lily.

The Question: After how many days will half of the pool be covered by the water-lily?


Answer: Because the water-lily doubles its size every day and the complete pool is covered after 20 days, half of the pool will be covered one day before that, after 19 days.

Conclusion: After 19 days half of the pool will be covered by the water-lily


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