At a school, there were 20 students from Club H and 25% more students from Club J. Some students from Club J left and the ratio of the number of students from Club H to the number of students from Club J became 5 : 2. How many students from Club J left?
|
Club H |
Club J |
Before |
20 |
25 |
Change |
|
- ? |
After |
5 u |
2 u |
Number of students from Club J at first in percent
= 100% + 25%
= 125%
Number of students from Club J at first
= 125% x 20
=
125100 x 20
= 25
Number of students in Club H remains unchanged.
5 u = 20
1 u = 20 ÷ 5 = 4
Number of students from Club J in the end
= 2 u
= 2 x 4
= 8
Number of students from Club J who left
= 25 - 8
= 17
Answer(s): 17