At a school, there were 25 pupils from Club P and 40% less pupils from Club Q. Some pupils joined Club Q and the ratio of the number of pupils from Club P to the number of pupils from Club Q became 5 : 4. How many pupils joined Club Q?
|
Club P |
Club Q |
Before |
25 |
15 |
Change |
|
+ ? |
After |
5 u |
4 u |
Number of pupils from Club Q at first in percent
= 100% - 40%
= 60%
Number of pupils from Club Q at first
= 60% x 25
=
60100 x 25
= 15
Number of pupils in Club P remains unchanged.
5 u = 25
1 u = 25 ÷ 5 = 5
Number of pupils from Club Q in the end
= 4 u
= 4 x 5
= 20
Number of pupils joined Club Q
= 20 - 15
= 5
Answer(s): 5