100 people went to a safari park.
35 were adults. Some children joined halfway and the ratio of the number of adults to the number of children became 6 : 7. How many children joined the safari park halfway?
|
Adults |
Children |
Total |
Before |
3x2 = 6 u |
2x2 = 4 u |
5x2 = 10 u |
Change |
|
+ ? |
|
After |
6 u |
7 u |
|
Fraction of the people that were children at first
= 1 -
35 =
25 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 = 10 u
10 u = 100
1 u = 100 ÷ 10 = 10
Number of children who joined halfway
= 7 u - 4 u
= 3 u
= 3 x 10
= 30
Answer(s): 30