At a school, there were 40 children from Club X and 20% more children from Club Y. Some children from Club Y left and the ratio of the number of children from Club X to the number of children from Club Y became 4 : 3. How many children from Club Y left?
| |
Club X |
Club Y |
| Before |
40 |
48 |
| Change |
|
- ? |
| After |
4 u |
3 u |
Number of children from Club Y at first in percent
= 100% + 20%
= 120%
Number of children from Club Y at first
= 120% x 40
=
120100 x 40
= 48
Number of children in Club X remains unchanged.
4 u = 40
1 u = 40 ÷ 4 = 10
Number of children from Club Y in the end
= 3 u
= 3 x 10
= 30
Number of children from Club Y who left
= 48 - 30
= 18
Answer(s): 18
