Anna went shopping with twice as much money as Gabby. After Anna spent $420, Gabby had four times as much money as Anna had left. How much less money did Gabby bring along for shopping than Anna?
| |
Anna |
Gabby |
Difference |
| Before |
2x4 =
8 u |
1x4 =
4 u |
4 u |
| Change |
- $420 |
|
|
| After |
1 u |
4 u |
|
The amount that Gabby has remains unchanged at first and in the end. Make the amount that Gabby has the same. LCM of 1 and 4 is 4.
Amount that Anna spent
= 8 u - 1 u
= 7 u
7 u = 420
1 u = 420 ÷ 7 = 60
Amount that Gabby brought along less than Anna
= 8 u - 4 u
= 4 u
= 4 x 60
= $240
Answer(s): $240
