At a school, there were 20 students from Club J and 10% more students from Club K. Some students from Club K left and the ratio of the number of students from Club J to the number of students from Club K became 5 : 4. How many students from Club K left?
| |
Club J |
Club K |
| Before |
20 |
22 |
| Change |
|
- ? |
| After |
5 u |
4 u |
Number of students from Club K at first in percent
= 100% + 10%
= 110%
Number of students from Club K at first
= 110% x 20
=
110100 x 20
= 22
Number of students in Club J remains unchanged.
5 u = 20
1 u = 20 ÷ 5 = 4
Number of students from Club K in the end
= 4 u
= 4 x 4
= 16
Number of students from Club K who left
= 22 - 16
= 6
Answer(s): 6
