At a bird park, there were
47 as many adults as children at first. After 68 adults left, there were 143 more children than adults remaining at a bird park. How many adults were at the bird park at first?
|
Adults |
Children |
Before |
4 u |
7 u |
Change |
- 68 |
|
After |
4 u - 68 |
7 u |
In the end, the number of children was 143 more than the number of adults. If another 143 adults entered the bird park, the number of children and adults would be the same.
7 u = 4 u - 68 + 143
7 u - 4 u = 143 - 68
3 u = 75
1 u = 75 ÷ 3 = 25
Number of adults at first
= 4 u
= 4 x 25
= 100
Answer: 100