At a park, there were
27 as many adults as children at first. After 70 adults left, there were 140 more children than adults remaining at a park. How many children were at the park?
| |
Adults |
Children |
| Before |
2 u |
7 u |
| Change |
- 70 |
|
| After |
2 u - 70 |
7 u |
In the end, the number of children was 140 more than the number of adults. If another 140 adults entered the park, the number of children and adults would be the same.
7 u = 2 u - 70 + 140
7 u - 2 u = 140 - 70
5 u = 70
1 u = 70 ÷ 5 = 14
Number of children at first
= 7 u
= 7 x 14
= 98
Answer: 98
