At a concert hall, there were
35 as many adults as children at first. After 53 adults left, there were 155 more children than adults remaining at a concert hall. How many children were at the concert hall?
|
Adults |
Children |
Before |
3 u |
5 u |
Change |
- 53 |
|
After |
3 u - 53 |
5 u |
In the end, the number of children was 155 more than the number of adults. If another 155 adults entered the concert hall, the number of children and adults would be the same.
5 u = 3 u - 53 + 155
5 u - 3 u = 155 - 53
2 u = 102
1 u = 102 ÷ 2 = 51
Number of children at first
= 5 u
= 5 x 51
= 255
Answer: 255