At a school, there were 60 pupils from Club A and 40% less pupils from Club B. Some pupils joined Club B and the ratio of the number of pupils from Club A to the number of pupils from Club B became 5 : 4. How many pupils joined Club B?
| |
Club A |
Club B |
| Before |
60 |
36 |
| Change |
|
+ ? |
| After |
5 u |
4 u |
Number of pupils from Club B at first in percent
= 100% - 40%
= 60%
Number of pupils from Club B at first
= 60% x 60
=
60100 x 60
= 36
Number of pupils in Club A remains unchanged.
5 u = 60
1 u = 60 ÷ 5 = 12
Number of pupils from Club B in the end
= 4 u
= 4 x 12
= 48
Number of pupils joined Club B
= 48 - 36
= 12
Answer(s): 12
