At a school, there were 10 girls from Club L and 20% more girls from Club M. Some girls from Club M left and the ratio of the number of girls from Club L to the number of girls from Club M became 5 : 3. How many girls from Club M left?
| |
Club L |
Club M |
| Before |
10 |
12 |
| Change |
|
- ? |
| After |
5 u |
3 u |
Number of girls from Club M at first in percent
= 100% + 20%
= 120%
Number of girls from Club M at first
= 120% x 10
=
120100 x 10
= 12
Number of girls in Club L remains unchanged.
5 u = 10
1 u = 10 ÷ 5 = 2
Number of girls from Club M in the end
= 3 u
= 3 x 2
= 6
Number of girls from Club M who left
= 12 - 6
= 6
Answer(s): 6
