#2 English puzzles

There is a pool . A lily is growing in it . The lily grows double size of its present size . If the pool covers with the lily in 20 days .

Now the question is that after how many days will the pools be covered half with the lily.

Answer :- After 19 days the pool will be half covered with the lily.

(this is because lets suppose that in the pool is going to be covered the full area in 2 days then it will be going to cover it half in a single day. Like that obnly if the pool gets covered in the 20 days then it will cover half in 19 days.)