576 people went to a bird park.
38 were adults. Some children left halfway and the ratio of the number of adults to the number of children became 9 : 11. How many children left the bird park halfway?
|
Adults |
Children |
Total |
Before |
3x3 = 9 u |
5x3 = 15 u |
8x3 = 24 u |
Change |
|
- ? |
|
After |
9 u |
11 u |
|
Fraction of the people that were children at first
= 1 -
38 =
58 Number of adults remains unchanged. Make the number of adults the same. LCM of 3 and 9 is 9.
Total number of people at first = 24 u
24 u = 576
1 u = 576 ÷ 24 = 24
Number of children who left halfway
= 15 u - 11 u
= 4 u
= 4 x 24
= 96
Answer(s): 96