At a school, there were 20 students from Club G and 25% more students from Club H. Some students from Club H left and the ratio of the number of students from Club G to the number of students from Club H became 4 : 3. How many students from Club H left?
| |
Club G |
Club H |
| Before |
20 |
25 |
| Change |
|
- ? |
| After |
4 u |
3 u |
Number of students from Club H at first in percent
= 100% + 25%
= 125%
Number of students from Club H at first
= 125% x 20
=
125100 x 20
= 25
Number of students in Club G remains unchanged.
4 u = 20
1 u = 20 ÷ 4 = 5
Number of students from Club H in the end
= 3 u
= 3 x 5
= 15
Number of students from Club H who left
= 25 - 15
= 10
Answer(s): 10
