Lily Is A Lilypad In A Small Pond. Lilly Doubles Her Size Each Day
Riddle: Lily is a lilypad in a small pond. Lilly doubles her size each day, On the 20th day she covers the whole pond. On what day was Lily half the size of the pond?
Answer: Day 19, it's not 10 because on day 20 she doubled from day 19, so 19 must be half the size of the pond.
Source: https://riddles.com/1757
