At a school, there were 20 students from Club N and 20% more students from Club P. Some students from Club P left and the ratio of the number of students from Club N to the number of students from Club P became 5 : 2. How many students from Club P left?
| |
Club N |
Club P |
| Before |
20 |
24 |
| Change |
|
- ? |
| After |
5 u |
2 u |
Number of students from Club P at first in percent
= 100% + 20%
= 120%
Number of students from Club P at first
= 120% x 20
=
120100 x 20
= 24
Number of students in Club N remains unchanged.
5 u = 20
1 u = 20 ÷ 5 = 4
Number of students from Club P in the end
= 2 u
= 2 x 4
= 8
Number of students from Club P who left
= 24 - 8
= 16
Answer(s): 16
