At a school, there were 40 boys from Club T and 40% less boys from Club U. Some boys joined Club U and the ratio of the number of boys from Club T to the number of boys from Club U became 4 : 3. How many boys joined Club U?
| |
Club T |
Club U |
| Before |
40 |
24 |
| Change |
|
+ ? |
| After |
4 u |
3 u |
Number of boys from Club U at first in percent
= 100% - 40%
= 60%
Number of boys from Club U at first
= 60% x 40
=
60100 x 40
= 24
Number of boys in Club T remains unchanged.
4 u = 40
1 u = 40 ÷ 4 = 10
Number of boys from Club U in the end
= 3 u
= 3 x 10
= 30
Number of boys joined Club U
= 30 - 24
= 6
Answer(s): 6
