At a school, there were 20 boys from Club X and 30% more boys from Club Y. Some boys from Club Y left and the ratio of the number of boys from Club X to the number of boys from Club Y became 5 : 2. How many boys from Club Y left?
| |
Club X |
Club Y |
| Before |
20 |
26 |
| Change |
|
- ? |
| After |
5 u |
2 u |
Number of boys from Club Y at first in percent
= 100% + 30%
= 130%
Number of boys from Club Y at first
= 130% x 20
=
130100 x 20
= 26
Number of boys in Club X remains unchanged.
5 u = 20
1 u = 20 ÷ 5 = 4
Number of boys from Club Y in the end
= 2 u
= 2 x 4
= 8
Number of boys from Club Y who left
= 26 - 8
= 18
Answer(s): 18
