140 people went to a zoo.
35 were adults. Some children left halfway and the ratio of the number of adults to the number of children became 6 : 1. How many children left the zoo halfway?
| |
Adults |
Children |
Total |
| Before |
3x2 =
6 u |
2x2 =
4 u |
5x2 =
10 u |
| Change |
|
- ? |
|
| After |
6 u |
1 u |
|
Fraction of the people that were children at first
= 1 -
35 =
25 Number of adults remains unchanged. Make the number of adults the same. LCM of 3 and 6 is 6.
Total number of people at first = 10 u
10 u = 140
1 u = 140 ÷ 10 = 14
Number of children who left halfway
= 4 u - 1 u
= 3 u
= 3 x 14
= 42
Answer(s): 42
