At a school, there were 20 girls from Club T and 25% more girls from Club U. Some girls from Club U left and the ratio of the number of girls from Club T to the number of girls from Club U became 4 : 3. How many girls from Club U left?
| |
Club T |
Club U |
| Before |
20 |
25 |
| Change |
|
- ? |
| After |
4 u |
3 u |
Number of girls from Club U at first in percent
= 100% + 25%
= 125%
Number of girls from Club U at first
= 125% x 20
=
125100 x 20
= 25
Number of girls in Club T remains unchanged.
4 u = 20
1 u = 20 ÷ 4 = 5
Number of girls from Club U in the end
= 3 u
= 3 x 5
= 15
Number of girls from Club U who left
= 25 - 15
= 10
Answer(s): 10
