At a school, there were 40 boys from Club V and 40% less boys from Club W. Some boys joined Club W and the ratio of the number of boys from Club V to the number of boys from Club W became 5 : 4. How many boys joined Club W?
| |
Club V |
Club W |
| Before |
40 |
24 |
| Change |
|
+ ? |
| After |
5 u |
4 u |
Number of boys from Club W at first in percent
= 100% - 40%
= 60%
Number of boys from Club W at first
= 60% x 40
=
60100 x 40
= 24
Number of boys in Club V remains unchanged.
5 u = 40
1 u = 40 ÷ 5 = 8
Number of boys from Club W in the end
= 4 u
= 4 x 8
= 32
Number of boys joined Club W
= 32 - 24
= 8
Answer(s): 8
