At a school, there were 20 girls from Club U and 10% more girls from Club V. Some girls from Club V left and the ratio of the number of girls from Club U to the number of girls from Club V became 4 : 3. How many girls from Club V left?
| |
Club U |
Club V |
| Before |
20 |
22 |
| Change |
|
- ? |
| After |
4 u |
3 u |
Number of girls from Club V at first in percent
= 100% + 10%
= 110%
Number of girls from Club V at first
= 110% x 20
=
110100 x 20
= 22
Number of girls in Club U remains unchanged.
4 u = 20
1 u = 20 ÷ 4 = 5
Number of girls from Club V in the end
= 3 u
= 3 x 5
= 15
Number of girls from Club V who left
= 22 - 15
= 7
Answer(s): 7
