At a bird park, there were
27 as many adults as children at first. After 67 adults left, there were 157 more children than adults remaining at a bird park. How many children were at the bird park?
|
Adults |
Children |
Before |
2 u |
7 u |
Change |
- 67 |
|
After |
2 u - 67 |
7 u |
In the end, the number of children was 157 more than the number of adults. If another 157 adults entered the bird park, the number of children and adults would be the same.
7 u = 2 u - 67 + 157
7 u - 2 u = 157 - 67
5 u = 90
1 u = 90 ÷ 5 = 18
Number of children at first
= 7 u
= 7 x 18
= 126
Answer: 126