616 people went to a safari park.
37 were adults. Some children joined halfway and the ratio of the number of adults to the number of children became 12 : 19. How many children joined the safari park halfway?
|
Adults |
Children |
Total |
Before |
3x4 = 12 u |
4x4 = 16 u |
7x4 = 28 u |
Change |
|
+ ? |
|
After |
12 u |
19 u |
|
Fraction of the people that were children at first
= 1 -
37 =
47 Number of adults remains unchanged. Make the number of adults the same. LCM of 3 and 12 is 12.
Total number of people at first = 28 u
28 u = 616
1 u = 616 ÷ 28 = 22
Number of children who joined halfway
= 19 u - 16 u
= 3 u
= 3 x 22
= 66
Answer(s): 66