At a concert hall, there were
47 as many adults as children at first. After 65 adults left, there were 185 more children than adults remaining at a concert hall. How many children were at the concert hall?
| |
Adults |
Children |
| Before |
4 u |
7 u |
| Change |
- 65 |
|
| After |
4 u - 65 |
7 u |
In the end, the number of children was 185 more than the number of adults. If another 185 adults entered the concert hall, the number of children and adults would be the same.
7 u = 4 u - 65 + 185
7 u - 4 u = 185 - 65
3 u = 120
1 u = 120 ÷ 3 = 40
Number of children at first
= 7 u
= 7 x 40
= 280
Answer: 280
