Paul had $2.10 less than Oscar. After Paul gave $3.90 to Oscar, Oscar would have four times as much money as Paul. How much money had Oscar at first?
| |
Oscar |
Paul |
| Before |
4 u - $3.90 |
1 u + $3.90 |
| Change |
+ $3.90 |
- $3.90 |
| After |
4 u |
1 u |
Paul had $2.10 less than Oscar. If another $2.10 was given to Paul, Oscar and Paul would have the same amount at first.
4 u - 3.90 = 1 u + 3.90 + 2.10
4 u - 1 u = 3.90 + 2.10 + 3.90
3 u = 9.90
1 u = 9.90 ÷ 3 = 3.30
Amount that Oscar had at first
= 4 u - 3.90
= 4 x 3.30 + 3.90
= 13.20 + 3.90
= $17.10
Answer(s): $17.10
