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A lily pad grows so that each day it doubles its size (area). On the 20th day of its life, it completely covers the pond. On what day of its life was the

pond half covered?
A. 5th B. 10th C. 15th D. 19th E. None of these.


Simple, on 19th day.
On 19th it will cover half the pond and next day
 i.e 20th day it will cover whole pond.
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 on 19th day it covers half of the pond....
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