At a school, there were 35 pupils from Club X and 20% more pupils from Club Y. Some pupils from Club Y left and the ratio of the number of pupils from Club X to the number of pupils from Club Y became 5 : 2. How many pupils from Club Y left?
| |
Club X |
Club Y |
| Before |
35 |
42 |
| Change |
|
- ? |
| After |
5 u |
2 u |
Number of pupils from Club Y at first in percent
= 100% + 20%
= 120%
Number of pupils from Club Y at first
= 120% x 35
=
120100 x 35
= 42
Number of pupils in Club X remains unchanged.
5 u = 35
1 u = 35 ÷ 5 = 7
Number of pupils from Club Y in the end
= 2 u
= 2 x 7
= 14
Number of pupils from Club Y who left
= 42 - 14
= 28
Answer(s): 28
