At a bird park, there were
38 as many adults as children at first. After 21 adults left, there were 126 more children than adults remaining at a bird park. How many children were at the bird park?
| |
Adults |
Children |
| Before |
3 u |
8 u |
| Change |
- 21 |
|
| After |
3 u - 21 |
8 u |
In the end, the number of children was 126 more than the number of adults. If another 126 adults entered the bird park, the number of children and adults would be the same.
8 u = 3 u - 21 + 126
8 u - 3 u = 126 - 21
5 u = 105
1 u = 105 ÷ 5 = 21
Number of children at first
= 8 u
= 8 x 21
= 168
Answer: 168
