260 people went to a safari park.
35 were children. Some adults joined halfway and the ratio of the number of children to the number of adults became 6 : 7. How many adults joined the safari park halfway?
|
Children |
Adults |
Total |
Before |
3x2 = 6 u |
2x2 = 4 u |
5x2 = 10 u |
Change |
|
+ ? |
|
After |
6 u |
7 u |
|
Fraction of the people that were adults at first
= 1 -
35 =
25 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 = 10 u
10 u = 260
1 u = 260 ÷ 10 = 26
Number of adults who joined halfway
= 7 u - 4 u
= 3 u
= 3 x 26
= 78
Answer(s): 78