At a school, there were 40 students from Club Y and 40% more students from Club Z. Some students from Club Z left and the ratio of the number of students from Club Y to the number of students from Club Z became 5 : 2. How many students from Club Z left?
| |
Club Y |
Club Z |
| Before |
40 |
56 |
| Change |
|
- ? |
| After |
5 u |
2 u |
Number of students from Club Z at first in percent
= 100% + 40%
= 140%
Number of students from Club Z at first
= 140% x 40
=
140100 x 40
= 56
Number of students in Club Y remains unchanged.
5 u = 40
1 u = 40 ÷ 5 = 8
Number of students from Club Z in the end
= 2 u
= 2 x 8
= 16
Number of students from Club Z who left
= 56 - 16
= 40
Answer(s): 40
