210 people went to a zoo.
37 were adults. Some children left halfway and the ratio of the number of adults to the number of children became 6 : 5. How many children left the zoo halfway?
| |
Adults |
Children |
Total |
| Before |
3x2 =
6 u |
4x2 =
8 u |
7x2 =
14 u |
| Change |
|
- ? |
|
| After |
6 u |
5 u |
|
Fraction of the people that were children at first
= 1 -
37 =
47 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 = 14 u
14 u = 210
1 u = 210 ÷ 14 = 15
Number of children who left halfway
= 8 u - 5 u
= 3 u
= 3 x 15
= 45
Answer(s): 45
