At a school, there were 60 boys from Club N and 25% less boys from Club P. Some boys joined Club P and the ratio of the number of boys from Club N to the number of boys from Club P became 5 : 4. How many boys joined Club P?
| |
Club N |
Club P |
| Before |
60 |
45 |
| Change |
|
+ ? |
| After |
5 u |
4 u |
Number of boys from Club P at first in percent
= 100% - 25%
= 75%
Number of boys from Club P at first
= 75% x 60
=
75100 x 60
= 45
Number of boys in Club N remains unchanged.
5 u = 60
1 u = 60 ÷ 5 = 12
Number of boys from Club P in the end
= 4 u
= 4 x 12
= 48
Number of boys joined Club P
= 48 - 45
= 3
Answer(s): 3
