340 people went to a bird park.
45 were children. Some adults left halfway and the ratio of the number of children to the number of adults became 16 : 1. How many adults left the bird park halfway?
| |
Children |
Adults |
Total |
| Before |
4x4 =
16 u |
1x4 =
4 u |
5x4 =
20 u |
| Change |
|
- ? |
|
| After |
16 u |
1 u |
|
Fraction of the people that were adults at first
= 1 -
45 =
15 Number of children remains unchanged. Make the number of children the same. LCM of 4 and 16 is 16.
Total number of people at first = 20 u
20 u = 340
1 u = 340 ÷ 20 = 17
Number of adults who left halfway
= 4 u - 1 u
= 3 u
= 3 x 17
= 51
Answer(s): 51
