At a museum, there were
25 as many adults as children at first. After 57 adults left, there were 147 more children than adults remaining at a museum. How many adults were at the museum at first?
| |
Adults |
Children |
| Before |
2 u |
5 u |
| Change |
- 57 |
|
| After |
2 u - 57 |
5 u |
In the end, the number of children was 147 more than the number of adults. If another 147 adults entered the museum, the number of children and adults would be the same.
5 u = 2 u - 57 + 147
5 u - 2 u = 147 - 57
3 u = 90
1 u = 90 ÷ 3 = 30
Number of adults at first
= 2 u
= 2 x 30
= 60
Answer: 60
