252 people went to a safari park.
47 were adults. Some children joined halfway and the ratio of the number of adults to the number of children became 8 : 9. How many children joined the safari park halfway?
|
Adults |
Children |
Total |
Before |
4x2 = 8 u |
3x2 = 6 u |
7x2 = 14 u |
Change |
|
+ ? |
|
After |
8 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 8 is 8.
Total number of people at first = 14 u
14 u = 252
1 u = 252 ÷ 14 = 18
Number of children who joined halfway
= 9 u - 6 u
= 3 u
= 3 x 18
= 54
Answer(s): 54