546 people went to a zoo.
37 were children. Some adults joined halfway and the ratio of the number of children to the number of adults became 9 : 14. How many adults joined the zoo halfway?
|
Children |
Adults |
Total |
Before |
3x3 = 9 u |
4x3 = 12 u |
7x3 = 21 u |
Change |
|
+ ? |
|
After |
9 u |
14 u |
|
Fraction of the people that were adults at first
= 1 -
37 =
47 Number of children remains unchanged. Make the number of children the same. LCM of 3 and 9 is 9.
Total number of people at first = 21 u
21 u = 546
1 u = 546 ÷ 21 = 26
Number of adults who joined halfway
= 14 u - 12 u
= 2 u
= 2 x 26
= 52
Answer(s): 52