The Mysterious Planes

Riddle: In front of two planes, there is one. In behind two planes, there is one. In between two planes, there is one. How many planes are there?

Answer: 3 planes. If there are three planes in a row, in front of two, there is one, in behind two, there is one, and in between two, there is one.

Source: https://www.riddles.com/index.php/3206

In front of two planes, there is one. In behind two planes, there is one. In between two planes, there is one. How many planes are there? — The Mysterious Planes by Juyoung v1.

Riddle: In front of two planes, there is one. In behind two planes, there is one. In between two planes, there is one. How many planes are there? Answer: 3 planes. If there are three planes in a row, in front of two, there is one, in behind two, there is one, and in between two, there is one. — by Juyoung v2.