At a concert hall, there were
47 as many adults as children at first. After 28 adults left, there were 127 more children than adults remaining at a concert hall. How many adults were at the concert hall at first?
|
Adults |
Children |
Before |
4 u |
7 u |
Change |
- 28 |
|
After |
4 u - 28 |
7 u |
In the end, the number of children was 127 more than the number of adults. If another 127 adults entered the concert hall, the number of children and adults would be the same.
7 u = 4 u - 28 + 127
7 u - 4 u = 127 - 28
3 u = 99
1 u = 99 ÷ 3 = 33
Number of adults at first
= 4 u
= 4 x 33
= 132
Answer: 132