At a school, there were 20 students from Club N and 40% less students from Club P. Some students joined Club P and the ratio of the number of students from Club N to the number of students from Club P became 4 : 3. How many students joined Club P?
| |
Club N |
Club P |
| Before |
20 |
12 |
| Change |
|
+ ? |
| After |
4 u |
3 u |
Number of students from Club P at first in percent
= 100% - 40%
= 60%
Number of students from Club P at first
= 60% x 20
=
60100 x 20
= 12
Number of students in Club N remains unchanged.
4 u = 20
1 u = 20 ÷ 4 = 5
Number of students from Club P in the end
= 3 u
= 3 x 5
= 15
Number of students joined Club P
= 15 - 12
= 3
Answer(s): 3
