At a zoo, there were
35 as many adults as children at first. After 65 adults left, there were 121 more children than adults remaining at a zoo. How many children were at the zoo?
|
Adults |
Children |
Before |
3 u |
5 u |
Change |
- 65 |
|
After |
3 u - 65 |
5 u |
In the end, the number of children was 121 more than the number of adults. If another 121 adults entered the zoo, the number of children and adults would be the same.
5 u = 3 u - 65 + 121
5 u - 3 u = 121 - 65
2 u = 56
1 u = 56 ÷ 2 = 28
Number of children at first
= 5 u
= 5 x 28
= 140
Answer: 140