There is a duck in front of two ducks.There is a duck between two ducks.

问题描述:

There is a duck in front of two ducks.There is a duck between two ducks.
There is a duck in front of two ducks.
There is a duck between two ducks.
There is a duck behind two ducks.
How many ducks are there?
聪明的算出了吗?There are()

three ducks