At a school, there were 40 pupils from Club P and 30% 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 |
40 |
28 |
Change |
|
+ ? |
After |
5 u |
4 u |
Number of pupils from Club Q at first in percent
= 100% - 30%
= 70%
Number of pupils from Club Q at first
= 70% x 40
=
70100 x 40
= 28
Number of pupils in Club P remains unchanged.
5 u = 40
1 u = 40 ÷ 5 = 8
Number of pupils from Club Q in the end
= 4 u
= 4 x 8
= 32
Number of pupils joined Club Q
= 32 - 28
= 4
Answer(s): 4