At a school, there were 45 girls from Club Q and 40% less girls from Club R. Some girls joined Club R and the ratio of the number of girls from Club Q to the number of girls from Club R became 5 : 4. How many girls joined Club R?
| |
Club Q |
Club R |
| Before |
45 |
27 |
| Change |
|
+ ? |
| After |
5 u |
4 u |
Number of girls from Club R at first in percent
= 100% - 40%
= 60%
Number of girls from Club R at first
= 60% x 45
=
60100 x 45
= 27
Number of girls in Club Q remains unchanged.
5 u = 45
1 u = 45 ÷ 5 = 9
Number of girls from Club R in the end
= 4 u
= 4 x 9
= 36
Number of girls joined Club R
= 36 - 27
= 9
Answer(s): 9
