At a school, there were 30 pupils from Club X and 40% 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 3 : 2. How many pupils from Club Y left?
| |
Club X |
Club Y |
| Before |
30 |
42 |
| Change |
|
- ? |
| After |
3 u |
2 u |
Number of pupils from Club Y at first in percent
= 100% + 40%
= 140%
Number of pupils from Club Y at first
= 140% x 30
=
140100 x 30
= 42
Number of pupils in Club X remains unchanged.
3 u = 30
1 u = 30 ÷ 3 = 10
Number of pupils from Club Y in the end
= 2 u
= 2 x 10
= 20
Number of pupils from Club Y who left
= 42 - 20
= 22
Answer(s): 22
