At a school, there were 10 students from Club U and 20% more students from Club V. Some students from Club V left and the ratio of the number of students from Club U to the number of students from Club V became 5 : 4. How many students from Club V left?
| |
Club U |
Club V |
| Before |
10 |
12 |
| Change |
|
- ? |
| After |
5 u |
4 u |
Number of students from Club V at first in percent
= 100% + 20%
= 120%
Number of students from Club V at first
= 120% x 10
=
120100 x 10
= 12
Number of students in Club U remains unchanged.
5 u = 10
1 u = 10 ÷ 5 = 2
Number of students from Club V in the end
= 4 u
= 4 x 2
= 8
Number of students from Club V who left
= 12 - 8
= 4
Answer(s): 4
