Eva went shopping with twice as much money as Mary. After Eva spent $490, Mary had four times as much money as Eva had left. How much less money did Mary bring along for shopping than Eva?
| |
Eva |
Mary |
Difference |
| Before |
2x4 =
8 u |
1x4 =
4 u |
4 u |
| Change |
- $490 |
|
|
| After |
1 u |
4 u |
|
The amount that Mary has remains unchanged at first and in the end. Make the amount that Mary has the same. LCM of 1 and 4 is 4.
Amount that Eva spent
= 8 u - 1 u
= 7 u
7 u = 490
1 u = 490 ÷ 7 = 70
Amount that Mary brought along less than Eva
= 8 u - 4 u
= 4 u
= 4 x 70
= $280
Answer(s): $280
