At a school, there were 15 children from Club P and 40% less children from Club Q. Some children joined Club Q and the ratio of the number of children from Club P to the number of children from Club Q became 5 : 4. How many children joined Club Q?
| |
Club P |
Club Q |
| Before |
15 |
9 |
| Change |
|
+ ? |
| After |
5 u |
4 u |
Number of children from Club Q at first in percent
= 100% - 40%
= 60%
Number of children from Club Q at first
= 60% x 15
=
60100 x 15
= 9
Number of children in Club P remains unchanged.
5 u = 15
1 u = 15 ÷ 5 = 3
Number of children from Club Q in the end
= 4 u
= 4 x 3
= 12
Number of children joined Club Q
= 12 - 9
= 3
Answer(s): 3
