At a school, there were 40 children from Club C and 10% more children from Club D. Some children from Club D left and the ratio of the number of children from Club C to the number of children from Club D became 4 : 3. How many children from Club D left?
| |
Club C |
Club D |
| Before |
40 |
44 |
| Change |
|
- ? |
| After |
4 u |
3 u |
Number of children from Club D at first in percent
= 100% + 10%
= 110%
Number of children from Club D at first
= 110% x 40
=
110100 x 40
= 44
Number of children in Club C remains unchanged.
4 u = 40
1 u = 40 ÷ 4 = 10
Number of children from Club D in the end
= 3 u
= 3 x 10
= 30
Number of children from Club D who left
= 44 - 30
= 14
Answer(s): 14
