540 people went to a tourist attraction.
25 were children. Some adults left halfway and the ratio of the number of children to the number of adults became 8 : 9. How many adults left the tourist attraction halfway?
| |
Children |
Adults |
Total |
| Before |
2x4 =
8 u |
3x4 =
12 u |
5x4 =
20 u |
| Change |
|
- ? |
|
| After |
8 u |
9 u |
|
Fraction of the people that were adults at first
= 1 -
25 =
35 Number of children remains unchanged. Make the number of children the same. LCM of 2 and 8 is 8.
Total number of people at first = 20 u
20 u = 540
1 u = 540 ÷ 20 = 27
Number of adults who left halfway
= 12 u - 9 u
= 3 u
= 3 x 27
= 81
Answer(s): 81
