At a school, there were 60 boys from Club X and 30% less boys from Club Y. Some boys joined Club Y and the ratio of the number of boys from Club X to the number of boys from Club Y became 6 : 5. How many boys joined Club Y?
|
Club X |
Club Y |
Before |
60 |
42 |
Change |
|
+ ? |
After |
6 u |
5 u |
Number of boys from Club Y at first in percent
= 100% - 30%
= 70%
Number of boys from Club Y at first
= 70% x 60
=
70100 x 60
= 42
Number of boys in Club X remains unchanged.
6 u = 60
1 u = 60 ÷ 6 = 10
Number of boys from Club Y in the end
= 5 u
= 5 x 10
= 50
Number of boys joined Club Y
= 50 - 42
= 8
Answer(s): 8