110 people went to a zoo.
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 zoo 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 = 110
1 u = 110 ÷ 10 = 11
Number of children who joined halfway
= 7 u - 4 u
= 3 u
= 3 x 11
= 33
Answer(s): 33
