In the middle of a round pool lies a lily.The water lily doubles in size every day. After exact 20 days ,the lily covers the complete pool after how many days will the water lily cover half of the pool .

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

I have highlighted the catch .Now can you think of the answer ?? Yes it is pretty simple , the answer is 19. It is given the lily doubles in size everyday .If it completely covers the pool in 20 days then it must have covered half of the pool in 19 Days.

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