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ferdinand the magician  who loves flowers. he has part of a field
planted with flowers that keeps doubling in size  everyday. from the time that the first flower
appears until the field is covered takes about 40 days. on what day is the
field half covered.

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AL2006id
If it doubles in coverage every day, and it is completely covered
in 40 days, then it was half covered on the 39th day.

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