504 people went to a 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 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 = 504
1 u = 504 ÷ 24 = 21
Number of children who left halfway
= 15 u - 11 u
= 4 u
= 4 x 21
= 84
Answer(s): 84
