At a school, there were 60 students from Club J and 30% less students from Club K. Some students joined Club K and the ratio of the number of students from Club J to the number of students from Club K became 6 : 5. How many students joined Club K?
| |
Club J |
Club K |
| Before |
60 |
42 |
| Change |
|
+ ? |
| After |
6 u |
5 u |
Number of students from Club K at first in percent
= 100% - 30%
= 70%
Number of students from Club K at first
= 70% x 60
=
70100 x 60
= 42
Number of students in Club J remains unchanged.
6 u = 60
1 u = 60 ÷ 6 = 10
Number of students from Club K in the end
= 5 u
= 5 x 10
= 50
Number of students joined Club K
= 50 - 42
= 8
Answer(s): 8
