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