At a school, there were 30 girls from Club V and 30% less girls from Club W. Some girls joined Club W and the ratio of the number of girls from Club V to the number of girls from Club W became 5 : 4. How many girls joined Club W?
| |
Club V |
Club W |
| Before |
30 |
21 |
| Change |
|
+ ? |
| After |
5 u |
4 u |
Number of girls from Club W at first in percent
= 100% - 30%
= 70%
Number of girls from Club W at first
= 70% x 30
=
70100 x 30
= 21
Number of girls in Club V remains unchanged.
5 u = 30
1 u = 30 ÷ 5 = 6
Number of girls from Club W in the end
= 4 u
= 4 x 6
= 24
Number of girls joined Club W
= 24 - 21
= 3
Answer(s): 3
