Wednesday, October 7, 2015

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 lily will cover the complete pool.
After how many days will the water lily cover half of the pool?



Ans:

In 19 days.
In the 19th day, the water lily fills half of the pool as of 20th day and it is mentioned that in 20th day tha pool is fully covered. So it will take 19day to fill half the pool by water lily.
   

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