At a school, there were 60 students from Club X and 10% more students from Club Y. Some students from Club Y left and the ratio of the number of students from Club X to the number of students from Club Y became 5 : 2. How many students from Club Y left?
| |
Club X |
Club Y |
| Before |
60 |
66 |
| Change |
|
- ? |
| After |
5 u |
2 u |
Number of students from Club Y at first in percent
= 100% + 10%
= 110%
Number of students from Club Y at first
= 110% x 60
=
110100 x 60
= 66
Number of students in Club X remains unchanged.
5 u = 60
1 u = 60 ÷ 5 = 12
Number of students from Club Y in the end
= 2 u
= 2 x 12
= 24
Number of students from Club Y who left
= 66 - 24
= 42
Answer(s): 42
