At a school, there were 60 girls from Club D and 20% more girls from Club E. Some girls from Club E left and the ratio of the number of girls from Club D to the number of girls from Club E became 5 : 2. How many girls from Club E left?
| |
Club D |
Club E |
| Before |
60 |
72 |
| Change |
|
- ? |
| After |
5 u |
2 u |
Number of girls from Club E at first in percent
= 100% + 20%
= 120%
Number of girls from Club E at first
= 120% x 60
=
120100 x 60
= 72
Number of girls in Club D remains unchanged.
5 u = 60
1 u = 60 ÷ 5 = 12
Number of girls from Club E in the end
= 2 u
= 2 x 12
= 24
Number of girls from Club E who left
= 72 - 24
= 48
Answer(s): 48
