At a school, there were 40 pupils from Club R and 10% more pupils from Club S. Some pupils from Club S left and the ratio of the number of pupils from Club R to the number of pupils from Club S became 5 : 2. How many pupils from Club S left?
| |
Club R |
Club S |
| Before |
40 |
44 |
| Change |
|
- ? |
| After |
5 u |
2 u |
Number of pupils from Club S at first in percent
= 100% + 10%
= 110%
Number of pupils from Club S at first
= 110% x 40
=
110100 x 40
= 44
Number of pupils in Club R remains unchanged.
5 u = 40
1 u = 40 ÷ 5 = 8
Number of pupils from Club S in the end
= 2 u
= 2 x 8
= 16
Number of pupils from Club S who left
= 44 - 16
= 28
Answer(s): 28
