Sarah went shopping with twice as much money as Tina. After Sarah spent $560, Tina had four times as much money as Sarah had left. How much more money did Sarah bring along for shopping than Tina?
| |
Sarah |
Tina |
Difference |
| Before |
2x4 =
8 u |
1x4 =
4 u |
4 u |
| Change |
- $560 |
|
|
| After |
1 u |
4 u |
|
The amount that Tina has remains unchanged at first and in the end. Make the amount that Tina has the same. LCM of 1 and 4 is 4.
Amount that Sarah spent
= 8 u - 1 u
= 7 u
7 u = 560
1 u = 560 ÷ 7 = 80
Amount that Sarah brought along more than Tina
= 8 u - 4 u
= 4 u
= 4 x 80
= $320
Answer(s): $320
