At a school, there were 30 children from Club P and 30% 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 |
30 |
21 |
Change |
|
+ ? |
After |
5 u |
4 u |
Number of children from Club Q at first in percent
= 100% - 30%
= 70%
Number of children from Club Q at first
= 70% x 30
=
70100 x 30
= 21
Number of children in Club P remains unchanged.
5 u = 30
1 u = 30 ÷ 5 = 6
Number of children from Club Q in the end
= 4 u
= 4 x 6
= 24
Number of children joined Club Q
= 24 - 21
= 3
Answer(s): 3