At a school, there were 72 children from Club H and 25% less children from Club J. Some children joined Club J and the ratio of the number of children from Club H to the number of children from Club J became 6 : 5. How many children joined Club J?
| |
Club H |
Club J |
| Before |
72 |
54 |
| Change |
|
+ ? |
| After |
6 u |
5 u |
Number of children from Club J at first in percent
= 100% - 25%
= 75%
Number of children from Club J at first
= 75% x 72
=
75100 x 72
= 54
Number of children in Club H remains unchanged.
6 u = 72
1 u = 72 ÷ 6 = 12
Number of children from Club J in the end
= 5 u
= 5 x 12
= 60
Number of children joined Club J
= 60 - 54
= 6
Answer(s): 6
