At a school, there were 30 students from Club R and 40% more students from Club S. Some students from Club S left and the ratio of the number of students from Club R to the number of students from Club S became 3 : 2. How many students from Club S left?
| |
Club R |
Club S |
| Before |
30 |
42 |
| Change |
|
- ? |
| After |
3 u |
2 u |
Number of students from Club S at first in percent
= 100% + 40%
= 140%
Number of students from Club S at first
= 140% x 30
=
140100 x 30
= 42
Number of students in Club R remains unchanged.
3 u = 30
1 u = 30 ÷ 3 = 10
Number of students from Club S in the end
= 2 u
= 2 x 10
= 20
Number of students from Club S who left
= 42 - 20
= 22
Answer(s): 22
