At a school, there were 30 children from Club E and 20% more children from Club F. Some children from Club F left and the ratio of the number of children from Club E to the number of children from Club F became 3 : 2. How many children from Club F left?
| |
Club E |
Club F |
| Before |
30 |
36 |
| Change |
|
- ? |
| After |
3 u |
2 u |
Number of children from Club F at first in percent
= 100% + 20%
= 120%
Number of children from Club F at first
= 120% x 30
=
120100 x 30
= 36
Number of children in Club E remains unchanged.
3 u = 30
1 u = 30 ÷ 3 = 10
Number of children from Club F in the end
= 2 u
= 2 x 10
= 20
Number of children from Club F who left
= 36 - 20
= 16
Answer(s): 16
