504 people went to a theme park.
47 were children. Some adults joined halfway and the ratio of the number of children to the number of adults became 12 : 11. How many adults joined the theme park halfway?
| |
Children |
Adults |
Total |
| Before |
4x3 =
12 u |
3x3 =
9 u |
7x3 =
21 u |
| Change |
|
+ ? |
|
| After |
12 u |
11 u |
|
Fraction of the people that were adults at first
= 1 -
47 =
37 Number of children remains unchanged. Make the number of children the same. LCM of 4 and 12 is 12.
Total number of people at first = 21 u
21 u = 504
1 u = 504 ÷ 21 = 24
Number of adults who joined halfway
= 11 u - 9 u
= 2 u
= 2 x 24
= 48
Answer(s): 48
