David had $36.90 more than Lee. After Lee had spent
56 of his money, David had $72.40 more than Lee. How much money did David have at first?
| |
David |
Lee |
More |
| Before |
6 u + $36.90 |
6 u |
$36.90 |
| Change |
|
- 5 u |
|
| After |
6 u + $36.90 |
1 u |
5 u + $36.90 |
David had $72.40 more than Lee in the end.
6 u + 36.90 - 1 u = 72.40
5 u + 36.90 = 72.40
5 u = 72.40 - 36.90
5 u = 35.50
1 u = 35.50 ÷ 5 = 7.10
Amount that David had at first
= 6 u + 36.90
= 6 x 7.10 + 36.90
= 42.60 + 36.90
= $79.50
Answer(s): $79.50
