Question 55504: A patch of lily pads doubles its size each day after it starts growing in the pond. If a pond was completely covered just today, what part of it was covered in lily pads five days ago? Answer by stanbon(57347) (Show Source):
yesterday 1/2 of the pond was covered
day before that (1/2)of (1/2) or 1/4th was covered.
day before that 1/8th was covered
5 days before (1/2)^5 = 1/32 nd of the pond was covered.