At a school, there were 40 children from Club X and 40% less children from Club Y. Some children joined Club Y 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 joined Club Y?
| |
Club X |
Club Y |
| Before |
40 |
24 |
| Change |
|
+ ? |
| After |
4 u |
3 u |
Number of children from Club Y at first in percent
= 100% - 40%
= 60%
Number of children from Club Y at first
= 60% x 40
=
60100 x 40
= 24
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 joined Club Y
= 30 - 24
= 6
Answer(s): 6
