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