At a school, there were 55 boys from Club Q and 40% less boys from Club R. Some boys joined Club R and the ratio of the number of boys from Club Q to the number of boys from Club R became 5 : 4. How many boys joined Club R?
| |
Club Q |
Club R |
| Before |
55 |
33 |
| Change |
|
+ ? |
| After |
5 u |
4 u |
Number of boys from Club R at first in percent
= 100% - 40%
= 60%
Number of boys from Club R at first
= 60% x 55
=
60100 x 55
= 33
Number of boys in Club Q remains unchanged.
5 u = 55
1 u = 55 ÷ 5 = 11
Number of boys from Club R in the end
= 4 u
= 4 x 11
= 44
Number of boys joined Club R
= 44 - 33
= 11
Answer(s): 11
