At a school, there were 60 girls from Club W and 20% 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 6 : 5. How many girls from Club X left?
| |
Club W |
Club X |
| Before |
60 |
72 |
| Change |
|
- ? |
| After |
6 u |
5 u |
Number of girls from Club X at first in percent
= 100% + 20%
= 120%
Number of girls from Club X at first
= 120% x 60
=
120100 x 60
= 72
Number of girls in Club W remains unchanged.
6 u = 60
1 u = 60 ÷ 6 = 10
Number of girls from Club X in the end
= 5 u
= 5 x 10
= 50
Number of girls from Club X who left
= 72 - 50
= 22
Answer(s): 22
