At a school, there were 30 children from Club T and 20% more children from Club U. Some children from Club U left and the ratio of the number of children from Club T to the number of children from Club U became 6 : 5. How many children from Club U left?
| |
Club T |
Club U |
| Before |
30 |
36 |
| Change |
|
- ? |
| After |
6 u |
5 u |
Number of children from Club U at first in percent
= 100% + 20%
= 120%
Number of children from Club U at first
= 120% x 30
=
120100 x 30
= 36
Number of children in Club T remains unchanged.
6 u = 30
1 u = 30 ÷ 6 = 5
Number of children from Club U in the end
= 5 u
= 5 x 5
= 25
Number of children from Club U who left
= 36 - 25
= 11
Answer(s): 11
