378 people went to a tourist attraction.
47 were children. Some adults joined halfway and the ratio of the number of children to the number of adults became 8 : 9. How many adults joined the tourist attraction halfway?
|
Children |
Adults |
Total |
Before |
4x2 = 8 u |
3x2 = 6 u |
7x2 = 14 u |
Change |
|
+ ? |
|
After |
8 u |
9 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 8 is 8.
Total number of people at first = 14 u
14 u = 378
1 u = 378 ÷ 14 = 27
Number of adults who joined halfway
= 9 u - 6 u
= 3 u
= 3 x 27
= 81
Answer(s): 81