At the office building, Level L and Level M had an equal number of chairs at first. If 6 chairs were removed from Level M and 7 times as many chairs were removed from Level L as Level M, the number of chairs in Level M would be 5 times as many as in Level L. Find the number of chairs on each level.

	Level L	Level M
Before	1 u	1 u
Change	- 42	- 6
After	1 u - 42	1 u - 6

Number of chairs removed from Level L
= 7 x 6
= 42

Number of chairs on Level L and Level M at first is the same.

Number of chairs on Level M is 5 times as many as Level L in the end. If the number of chairs on Level L increases by 5 times, the number of chairs on Level L and Level M will be the same.

5(1 u - 42) = 1 u - 6
5 u - 210 = 1 u - 6 
5 u - 1 u = 210 - 6
4 u = 204

1 u = 204 ÷ 4 = 51

Number of chairs in each floor
= 1 u
= 51

Answer(s): 51