400 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 6 : 13. How many children joined the safari park halfway?
|
Adults |
Children |
Total |
Before |
3x2 = 6 u |
5x2 = 10 u |
8x2 = 16 u |
Change |
|
+ ? |
|
After |
6 u |
13 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 6 is 6.
Total number of people at first = 16 u
16 u = 400
1 u = 400 ÷ 16 = 25
Number of children who joined halfway
= 13 u - 10 u
= 3 u
= 3 x 25
= 75
Answer(s): 75