432 people went to a safari park.
38 were adults. Some children joined halfway and the ratio of the number of adults to the number of children became 9 : 19. How many children joined the safari park halfway?
|
Adults |
Children |
Total |
Before |
3x3 = 9 u |
5x3 = 15 u |
8x3 = 24 u |
Change |
|
+ ? |
|
After |
9 u |
19 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 = 432
1 u = 432 ÷ 24 = 18
Number of children who joined halfway
= 19 u - 15 u
= 4 u
= 4 x 18
= 72
Answer(s): 72