Seth had 3 times as much money as Oscar. After Seth had spent one-third of his money, he had $21 more than Oscar. How much money did Seth have at first?
| |
Seth |
Oscar |
| Before |
3 u |
1 u |
| Change |
- 1 u |
|
| After |
2 u |
1 u |
Amount that Seth had after he spent one-third of his money
= 3 u ÷ 3
= 1 u
Amount that Seth had more than Oscar in the end
= 2 u - 1 u
= 1 u
1 u = 21
Amount that Seth had at first
= 3 u
= 3 x 21
= $63
Answer(s): $63
