Paul and Andy had a total of $120. Paul gave $13 to Andy. In return, Andy gave $21 to Paul. In the end, Paul had $40 more than Andy. How much money did Paul have at first?
| |
Paul |
Andy |
Total |
| Before |
? |
|
$120 |
| Change 1 |
- $13 |
+ $13 |
|
| Change 2 |
+ $21 |
- $21 |
|
| After |
1 u + $40 |
1 u |
$120 |
Total amount that Paul and Andy had
= 1 u + 1 u + $40
= 2 u + 40
2 u + 40 = 120
2 u = 120 - 40
2 u = 80
1 u = 80 ÷ 2 = 40
Amount that Paul had in the end
= 1 u + 40
= 40 + 40
= $80
Amount that Paul had at first
= 80 - 21 + 13
= $72
Answer(s): $72
