840 people went to a theme park.
27 were adults. Some children left halfway and the ratio of the number of adults to the number of children became 8 : 17. How many children left the theme park halfway?
| |
Adults |
Children |
Total |
| Before |
2x4 =
8 u |
5x4 =
20 u |
7x4 =
28 u |
| Change |
|
- ? |
|
| After |
8 u |
17 u |
|
Fraction of the people that were children at first
= 1 -
27 =
57 Number of adults remains unchanged. Make the number of adults the same. LCM of 2 and 8 is 8.
Total number of people at first = 28 u
28 u = 840
1 u = 840 ÷ 28 = 30
Number of children who left halfway
= 20 u - 17 u
= 3 u
= 3 x 30
= 90
Answer(s): 90
