David had $63.20 more than Jack. After Jack had spent
23 of his money, David had $102.60 more than Jack. How much money did David have at first?
| |
David |
Jack |
More |
| Before |
3 u + $63.20 |
3 u |
$63.20 |
| Change |
|
- 2 u |
|
| After |
3 u + $63.20 |
1 u |
2 u + $63.20 |
David had $102.60 more than Jack in the end.
3 u + 63.20 - 1 u = 102.60
2 u + 63.20 = 102.60
2 u = 102.60 - 63.20
2 u = 39.40
1 u = 39.40 ÷ 2 = 19.70
Amount that David had at first
= 3 u + 63.20
= 3 x 19.70 + 63.20
= 59.10 + 63.20
= $122.30
Answer(s): $122.30
