960 people went to a tourist attraction.
38 were children. Some adults joined halfway and the ratio of the number of children to the number of adults became 12 : 23. How many adults joined the tourist attraction halfway?
| |
Children |
Adults |
Total |
| Before |
3x4 =
12 u |
5x4 =
20 u |
8x4 =
32 u |
| Change |
|
+ ? |
|
| After |
12 u |
23 u |
|
Fraction of the people that were adults at first
= 1 -
38 =
58 Number of children remains unchanged. Make the number of children the same. LCM of 3 and 12 is 12.
Total number of people at first = 32 u
32 u = 960
1 u = 960 ÷ 32 = 30
Number of adults who joined halfway
= 23 u - 20 u
= 3 u
= 3 x 30
= 90
Answer(s): 90
