210 people went to a park.
37 were children. Some adults joined halfway and the ratio of the number of children to the number of adults became 6 : 11. How many adults joined the park halfway?
| |
Children |
Adults |
Total |
| Before |
3x2 =
6 u |
4x2 =
8 u |
7x2 =
14 u |
| Change |
|
+ ? |
|
| After |
6 u |
11 u |
|
Fraction of the people that were adults at first
= 1 -
37 =
47 Number of children remains unchanged. Make the number of children 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 adults who joined halfway
= 11 u - 8 u
= 3 u
= 3 x 15
= 45
Answer(s): 45
