At a school, there were 35 students from Club V and 40% less students from Club W. Some students joined Club W and the ratio of the number of students from Club V to the number of students from Club W became 5 : 4. How many students joined Club W?
| |
Club V |
Club W |
| Before |
35 |
21 |
| Change |
|
+ ? |
| After |
5 u |
4 u |
Number of students from Club W at first in percent
= 100% - 40%
= 60%
Number of students from Club W at first
= 60% x 35
=
60100 x 35
= 21
Number of students in Club V remains unchanged.
5 u = 35
1 u = 35 ÷ 5 = 7
Number of students from Club W in the end
= 4 u
= 4 x 7
= 28
Number of students joined Club W
= 28 - 21
= 7
Answer(s): 7
