At a school, there were 50 children from Club B and 30% more children from Club C. Some children from Club C left and the ratio of the number of children from Club B to the number of children from Club C became 5 : 4. How many children from Club C left?
|
Club B |
Club C |
Before |
50 |
65 |
Change |
|
- ? |
After |
5 u |
4 u |
Number of children from Club C at first in percent
= 100% + 30%
= 130%
Number of children from Club C at first
= 130% x 50
=
130100 x 50
= 65
Number of children in Club B remains unchanged.
5 u = 50
1 u = 50 ÷ 5 = 10
Number of children from Club C in the end
= 4 u
= 4 x 10
= 40
Number of children from Club C who left
= 65 - 40
= 25
Answer(s): 25