Ferdinand the magician loves flowers. He has part of a field planted with flowers that keeps doubling in size every day. 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?
Answer (2)
If it doubles in coverage every day, and it is completely covered in 40 days, then it was half covered on the 39th day.
The field is half covered on Day 39, just one day before it becomes fully covered on Day 40. This is due to the fact that the field doubles in size every day. Therefore, if the field is fully covered on Day 40, it must be half covered on Day 39.
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