At a park, there were
47 as many adults as children at first. After 45 adults left, there were 129 more children than adults remaining at a park. How many adults were at the park at first?
| |
Adults |
Children |
| Before |
4 u |
7 u |
| Change |
- 45 |
|
| After |
4 u - 45 |
7 u |
In the end, the number of children was 129 more than the number of adults. If another 129 adults entered the park, the number of children and adults would be the same.
7 u = 4 u - 45 + 129
7 u - 4 u = 129 - 45
3 u = 84
1 u = 84 ÷ 3 = 28
Number of adults at first
= 4 u
= 4 x 28
= 112
Answer: 112
