At a school, there were 30 pupils from Club T and 20% more pupils from Club U. Some pupils from Club U left and the ratio of the number of pupils from Club T to the number of pupils from Club U became 5 : 2. How many pupils from Club U left?
|
Club T |
Club U |
Before |
30 |
36 |
Change |
|
- ? |
After |
5 u |
2 u |
Number of pupils from Club U at first in percent
= 100% + 20%
= 120%
Number of pupils from Club U at first
= 120% x 30
=
120100 x 30
= 36
Number of pupils in Club T remains unchanged.
5 u = 30
1 u = 30 ÷ 5 = 6
Number of pupils from Club U in the end
= 2 u
= 2 x 6
= 12
Number of pupils from Club U who left
= 36 - 12
= 24
Answer(s): 24