Seth had seven times as much money as Bobby. After Seth had spent $91, Bobby had twice as much money as Seth. How much more money than Bobby had Seth at first?
| |
Seth |
Bobby |
More |
Before
|
7x2 =
14 u |
1x2 =
2 u |
12 u |
| Change |
- $91 |
|
|
| After |
1 u |
2 u |
|
The amount that Bobby had remains unchanged. Make the amount that Bobby had the same. LCM of 1 and 2 is 2.
Amount that Mark had in the end = 1 u
14 u - 91 = 1 u
14 u - 1 u = 91
13 u = 91
1 u = 91 ÷ 13 = 7
Amount that Bobby had more than Seth at first
= 14 u - 2 u
= 12 u
= 12 x 7
= $84
Answer(s): $84
