728 people went to a park.
47 were children. Some adults joined halfway and the ratio of the number of children to the number of adults became 16 : 15. How many adults joined the park halfway?
| |
Children |
Adults |
Total |
| Before |
4x4 =
16 u |
3x4 =
12 u |
7x4 =
28 u |
| Change |
|
+ ? |
|
| After |
16 u |
15 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 16 is 16.
Total number of people at first = 28 u
28 u = 728
1 u = 728 ÷ 28 = 26
Number of adults who joined halfway
= 15 u - 12 u
= 3 u
= 3 x 26
= 78
Answer(s): 78
