At a school, there were 40 pupils from Club T and 25% more pupils from Club U. Some pupils from Club U left and the ratio of the number of pupils from Club T to the number of pupils from Club U became 5 : 2. How many pupils from Club U left?
| |
Club T |
Club U |
| Before |
40 |
50 |
| Change |
|
- ? |
| After |
5 u |
2 u |
Number of pupils from Club U at first in percent
= 100% + 25%
= 125%
Number of pupils from Club U at first
= 125% x 40
=
125100 x 40
= 50
Number of pupils in Club T remains unchanged.
5 u = 40
1 u = 40 ÷ 5 = 8
Number of pupils from Club U in the end
= 2 u
= 2 x 8
= 16
Number of pupils from Club U who left
= 50 - 16
= 34
Answer(s): 34
