At a theme park, there were
25 as many adults as children at first. After 51 adults left, there were 129 more children than adults remaining at a theme park. How many adults were at the theme park at first?
|
Adults |
Children |
Before |
2 u |
5 u |
Change |
- 51 |
|
After |
2 u - 51 |
5 u |
In the end, the number of children was 129 more than the number of adults. If another 129 adults entered the theme park, the number of children and adults would be the same.
5 u = 2 u - 51 + 129
5 u - 2 u = 129 - 51
3 u = 78
1 u = 78 ÷ 3 = 26
Number of adults at first
= 2 u
= 2 x 26
= 52
Answer: 52