At a school, there were 40 girls from Club W and 30% more girls from Club X. Some girls from Club X left and the ratio of the number of girls from Club W to the number of girls from Club X became 5 : 4. How many girls from Club X left?
| |
Club W |
Club X |
| Before |
40 |
52 |
| Change |
|
- ? |
| After |
5 u |
4 u |
Number of girls from Club X at first in percent
= 100% + 30%
= 130%
Number of girls from Club X at first
= 130% x 40
=
130100 x 40
= 52
Number of girls in Club W remains unchanged.
5 u = 40
1 u = 40 ÷ 5 = 8
Number of girls from Club X in the end
= 4 u
= 4 x 8
= 32
Number of girls from Club X who left
= 52 - 32
= 20
Answer(s): 20
