At a school, there were 60 pupils from Club E and 30% more pupils from Club F. Some pupils from Club F left and the ratio of the number of pupils from Club E to the number of pupils from Club F became 6 : 5. How many pupils from Club F left?
| |
Club E |
Club F |
| Before |
60 |
78 |
| Change |
|
- ? |
| After |
6 u |
5 u |
Number of pupils from Club F at first in percent
= 100% + 30%
= 130%
Number of pupils from Club F at first
= 130% x 60
=
130100 x 60
= 78
Number of pupils in Club E remains unchanged.
6 u = 60
1 u = 60 ÷ 6 = 10
Number of pupils from Club F in the end
= 5 u
= 5 x 10
= 50
Number of pupils from Club F who left
= 78 - 50
= 28
Answer(s): 28
