390 people went to a theme park.
25 were adults. Some children left halfway and the ratio of the number of adults to the number of children became 6 : 7. How many children left the theme park halfway?
| |
Adults |
Children |
Total |
| Before |
2x3 =
6 u |
3x3 =
9 u |
5x3 =
15 u |
| Change |
|
- ? |
|
| After |
6 u |
7 u |
|
Fraction of the people that were children at first
= 1 -
25 =
35 Number of adults remains unchanged. Make the number of adults the same. LCM of 2 and 6 is 6.
Total number of people at first = 15 u
15 u = 390
1 u = 390 ÷ 15 = 26
Number of children who left halfway
= 9 u - 7 u
= 2 u
= 2 x 26
= 52
Answer(s): 52
