At a zoo, there were
25 as many adults as children at first. After 49 adults left, there were 172 more children than adults remaining at a zoo. How many adults were at the zoo at first?
| |
Adults |
Children |
| Before |
2 u |
5 u |
| Change |
- 49 |
|
| After |
2 u - 49 |
5 u |
In the end, the number of children was 172 more than the number of adults. If another 172 adults entered the zoo, the number of children and adults would be the same.
5 u = 2 u - 49 + 172
5 u - 2 u = 172 - 49
3 u = 123
1 u = 123 ÷ 3 = 41
Number of adults at first
= 2 u
= 2 x 41
= 82
Answer: 82
