At a bird park, there were
25 as many adults as children at first. After 71 adults left, there were 197 more children than adults remaining at a bird park. How many adults were at the bird park at first?
| |
Adults |
Children |
| Before |
2 u |
5 u |
| Change |
- 71 |
|
| After |
2 u - 71 |
5 u |
In the end, the number of children was 197 more than the number of adults. If another 197 adults entered the bird park, the number of children and adults would be the same.
5 u = 2 u - 71 + 197
5 u - 2 u = 197 - 71
3 u = 126
1 u = 126 ÷ 3 = 42
Number of adults at first
= 2 u
= 2 x 42
= 84
Answer: 84
