At a school, there were 20 children from Club T and 40% less children from Club U. Some children joined Club U and the ratio of the number of children from Club T to the number of children from Club U became 5 : 4. How many children joined Club U?
| |
Club T |
Club U |
| Before |
20 |
12 |
| Change |
|
+ ? |
| After |
5 u |
4 u |
Number of children from Club U at first in percent
= 100% - 40%
= 60%
Number of children from Club U at first
= 60% x 20
=
60100 x 20
= 12
Number of children in Club T remains unchanged.
5 u = 20
1 u = 20 ÷ 5 = 4
Number of children from Club U in the end
= 4 u
= 4 x 4
= 16
Number of children joined Club U
= 16 - 12
= 4
Answer(s): 4
