At a school, there were 48 girls from Club R and 25% less girls from Club S. Some girls joined Club S and the ratio of the number of girls from Club R to the number of girls from Club S became 6 : 5. How many girls joined Club S?
| |
Club R |
Club S |
| Before |
48 |
36 |
| Change |
|
+ ? |
| After |
6 u |
5 u |
Number of girls from Club S at first in percent
= 100% - 25%
= 75%
Number of girls from Club S at first
= 75% x 48
=
75100 x 48
= 36
Number of girls in Club R remains unchanged.
6 u = 48
1 u = 48 ÷ 6 = 8
Number of girls from Club S in the end
= 5 u
= 5 x 8
= 40
Number of girls joined Club S
= 40 - 36
= 4
Answer(s): 4
