At a school, there were 40 girls from Club Q and 30% more girls from Club R. Some girls from Club R left and the ratio of the number of girls from Club Q to the number of girls from Club R became 4 : 3. How many girls from Club R left?
| |
Club Q |
Club R |
| Before |
40 |
52 |
| Change |
|
- ? |
| After |
4 u |
3 u |
Number of girls from Club R at first in percent
= 100% + 30%
= 130%
Number of girls from Club R at first
= 130% x 40
=
130100 x 40
= 52
Number of girls in Club Q remains unchanged.
4 u = 40
1 u = 40 ÷ 4 = 10
Number of girls from Club R in the end
= 3 u
= 3 x 10
= 30
Number of girls from Club R who left
= 52 - 30
= 22
Answer(s): 22
