Pierre and Peter had a total of $139. Pierre gave $13 to Peter. In return, Peter gave $37 to Pierre. In the end, Pierre had $17 more than Peter. How much money did Pierre have at first?
| |
Pierre |
Peter |
Total |
| Before |
? |
|
$139 |
| Change 1 |
- $13 |
+ $13 |
|
| Change 2 |
+ $37 |
- $37 |
|
| After |
1 u + $17 |
1 u |
$139 |
Total amount that Pierre and Peter had
= 1 u + 1 u + $17
= 2 u + 17
2 u + 17 = 139
2 u = 139 - 17
2 u = 122
1 u = 122 ÷ 2 = 61
Amount that Pierre had in the end
= 1 u + 17
= 61 + 17
= $78
Amount that Pierre had at first
= 78 - 37 + 13
= $54
Answer(s): $54
