At the school, Storey C and Storey D had an equal number of desks at first. If 6 desks were removed from Storey D and 6 times as many desks were removed from Storey C as Storey D, the number of desks in Storey D would be 4 times as many as in Storey C. Find the number of desks on each storey.

	Storey C	Storey D
Before	1 u	1 u
Change	- 36	- 6
After	1 u - 36	1 u - 6

Number of desks removed from Storey C
= 6 x 6
= 36

Number of desks on Storey C and Storey D at first is the same.

Number of desks on Storey D is 4 times as many as Storey C in the end. If the number of desks on Storey C increases by 4 times, the number of desks on Storey C and Storey D will be the same.

4(1 u - 36) = 1 u - 6
4 u - 144 = 1 u - 6 
4 u - 1 u = 144 - 6
3 u = 138

1 u = 138 ÷ 3 = 46

Number of desks in each floor
= 1 u
= 46

Answer(s): 46