At the school, Storey T and Storey U had an equal number of desks at first. If 7 desks were removed from Storey U and 4 times as many desks were removed from Storey T as Storey U, the number of desks in Storey U would be 4 times as many as in Storey T. Find the number of desks on each storey.
|
Storey T |
Storey U |
Before |
1 u |
1 u |
Change |
- 28 |
- 7 |
After |
1 u - 28 |
1 u - 7 |
Number of desks removed from Storey T
= 4 x 7
= 28
Number of desks on Storey T and Storey U at first is the same.
Number of desks on Storey U is 4 times as many as Storey T in the end. If the number of desks on Storey T increases by 4 times, the number of desks on Storey T and Storey U will be the same.
4(1 u - 28) = 1 u - 7
4 u - 112 = 1 u - 7
4 u - 1 u = 112 - 7
3 u = 105
1 u = 105 ÷ 3 = 35
Number of desks in each floor
= 1 u
= 35
Answer(s): 35