696 people went to a safari park.
58 were children. Some adults left halfway and the ratio of the number of children to the number of adults became 15 : 7. How many adults left the safari park halfway?
| |
Children |
Adults |
Total |
| Before |
5x3 =
15 u |
3x3 =
9 u |
8x3 =
24 u |
| Change |
|
- ? |
|
| After |
15 u |
7 u |
|
Fraction of the people that were adults at first
= 1 -
58 =
38 Number of children remains unchanged. Make the number of children the same. LCM of 5 and 15 is 15.
Total number of people at first = 24 u
24 u = 696
1 u = 696 ÷ 24 = 29
Number of adults who left halfway
= 9 u - 7 u
= 2 u
= 2 x 29
= 58
Answer(s): 58
