At a zoo, there were
27 as many adults as children at first. After 70 adults left, there were 115 more children than adults remaining at a zoo. How many children were at the zoo?
|
Adults |
Children |
Before |
2 u |
7 u |
Change |
- 70 |
|
After |
2 u - 70 |
7 u |
In the end, the number of children was 115 more than the number of adults. If another 115 adults entered the zoo, the number of children and adults would be the same.
7 u = 2 u - 70 + 115
7 u - 2 u = 115 - 70
5 u = 45
1 u = 45 ÷ 5 = 9
Number of children at first
= 7 u
= 7 x 9
= 63
Answer: 63