At a school, there were 60 girls from Club K and 30% less girls from Club L. Some girls joined Club L and the ratio of the number of girls from Club K to the number of girls from Club L became 5 : 4. How many girls joined Club L?
| |
Club K |
Club L |
| Before |
60 |
42 |
| Change |
|
+ ? |
| After |
5 u |
4 u |
Number of girls from Club L at first in percent
= 100% - 30%
= 70%
Number of girls from Club L at first
= 70% x 60
=
70100 x 60
= 42
Number of girls in Club K remains unchanged.
5 u = 60
1 u = 60 ÷ 5 = 12
Number of girls from Club L in the end
= 4 u
= 4 x 12
= 48
Number of girls joined Club L
= 48 - 42
= 6
Answer(s): 6
