At the school, Level E and Level F had an equal number of desks at first. If 7 desks were removed from Level F and 5 times as many desks were removed from Level E as Level F, the number of desks in Level F would be 3 times as many as in Level E. Find the number of desks on each level.

	Level E	Level F
Before	1 u	1 u
Change	- 35	- 7
After	1 u - 35	1 u - 7

Number of desks removed from Level E
= 5 x 7
= 35

Number of desks on Level E and Level F at first is the same.

Number of desks on Level F is 3 times as many as Level E in the end. If the number of desks on Level E increases by 3 times, the number of desks on Level E and Level F will be the same.

3(1 u - 35) = 1 u - 7
3 u - 105 = 1 u - 7 
3 u - 1 u = 105 - 7
2 u = 98

1 u = 98 ÷ 2 = 49

Number of desks in each floor
= 1 u
= 49

Answer(s): 49