At a school, there were 55 pupils from Club S and 20% more pupils from Club T. Some pupils from Club T left and the ratio of the number of pupils from Club S to the number of pupils from Club T became 5 : 2. How many pupils from Club T left?
| |
Club S |
Club T |
| Before |
55 |
66 |
| Change |
|
- ? |
| After |
5 u |
2 u |
Number of pupils from Club T at first in percent
= 100% + 20%
= 120%
Number of pupils from Club T at first
= 120% x 55
=
120100 x 55
= 66
Number of pupils in Club S remains unchanged.
5 u = 55
1 u = 55 ÷ 5 = 11
Number of pupils from Club T in the end
= 2 u
= 2 x 11
= 22
Number of pupils from Club T who left
= 66 - 22
= 44
Answer(s): 44
