At a school, there were 10 pupils from Club T and 30% 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 |
10 |
13 |
Change |
|
- ? |
After |
5 u |
2 u |
Number of pupils from Club U at first in percent
= 100% + 30%
= 130%
Number of pupils from Club U at first
= 130% x 10
=
130100 x 10
= 13
Number of pupils in Club T remains unchanged.
5 u = 10
1 u = 10 ÷ 5 = 2
Number of pupils from Club U in the end
= 2 u
= 2 x 2
= 4
Number of pupils from Club U who left
= 13 - 4
= 9
Answer(s): 9