784 people went to a theme park.
47 were adults. Some children left halfway and the ratio of the number of adults to the number of children became 16 : 9. How many children left the theme park halfway?
|
Adults |
Children |
Total |
Before |
4x4 = 16 u |
3x4 = 12 u |
7x4 = 28 u |
Change |
|
- ? |
|
After |
16 u |
9 u |
|
Fraction of the people that were children at first
= 1 -
47 =
37 Number of adults remains unchanged. Make the number of adults the same. LCM of 4 and 16 is 16.
Total number of people at first = 28 u
28 u = 784
1 u = 784 ÷ 28 = 28
Number of children who left halfway
= 12 u - 9 u
= 3 u
= 3 x 28
= 84
Answer(s): 84