At a school, there were 60 children from Club J and 25% less children from Club K. Some children joined Club K and the ratio of the number of children from Club J to the number of children from Club K became 6 : 5. How many children joined Club K?
| |
Club J |
Club K |
| Before |
60 |
45 |
| Change |
|
+ ? |
| After |
6 u |
5 u |
Number of children from Club K at first in percent
= 100% - 25%
= 75%
Number of children from Club K at first
= 75% x 60
=
75100 x 60
= 45
Number of children in Club J remains unchanged.
6 u = 60
1 u = 60 ÷ 6 = 10
Number of children from Club K in the end
= 5 u
= 5 x 10
= 50
Number of children joined Club K
= 50 - 45
= 5
Answer(s): 5
