At a zoo, there were
25 as many adults as children at first. After 31 adults left, there were 175 more children than adults remaining at a zoo. How many children were at the zoo?
| |
Adults |
Children |
| Before |
2 u |
5 u |
| Change |
- 31 |
|
| After |
2 u - 31 |
5 u |
In the end, the number of children was 175 more than the number of adults. If another 175 adults entered the zoo, the number of children and adults would be the same.
5 u = 2 u - 31 + 175
5 u - 2 u = 175 - 31
3 u = 144
1 u = 144 ÷ 3 = 48
Number of children at first
= 5 u
= 5 x 48
= 240
Answer: 240
