At a school, there were 30 children from Club D and 10% more children from Club E. Some children from Club E left and the ratio of the number of children from Club D to the number of children from Club E became 6 : 5. How many children from Club E left?
| |
Club D |
Club E |
| Before |
30 |
33 |
| Change |
|
- ? |
| After |
6 u |
5 u |
Number of children from Club E at first in percent
= 100% + 10%
= 110%
Number of children from Club E at first
= 110% x 30
=
110100 x 30
= 33
Number of children in Club D remains unchanged.
6 u = 30
1 u = 30 ÷ 6 = 5
Number of children from Club E in the end
= 5 u
= 5 x 5
= 25
Number of children from Club E who left
= 33 - 25
= 8
Answer(s): 8
