At the hospital, Storey D and Storey E had an equal number of beds at first. If 9 beds were removed from Storey E and 3 times as many beds were removed from Storey D as Storey E, the number of beds in Storey E would be 3 times as many as in Storey D. Find the number of beds on each storey.

	Storey D	Storey E
Before	1 u	1 u
Change	- 27	- 9
After	1 u - 27	1 u - 9

Number of beds removed from Storey D
= 3 x 9
= 27

Number of beds on Storey D and Storey E at first is the same.

Number of beds on Storey E is 3 times as many as Storey D in the end. If the number of beds on Storey D increases by 3 times, the number of beds on Storey D and Storey E will be the same.

3(1 u - 27) = 1 u - 9
3 u - 81 = 1 u - 9 
3 u - 1 u = 81 - 9
2 u = 72

1 u = 72 ÷ 2 = 36

Number of beds in each floor
= 1 u
= 36

Answer(s): 36