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