Barbara went shopping with thrice as much money as Gabby. After Barbara spent $350, Gabby had twice as much money as Barbara had left. How much less money did Gabby bring along for shopping than Barbara?
| |
Barbara |
Gabby |
Difference |
| Before |
3x2 =
6 u |
1x2 =
2 u |
4 u |
| Change |
- $350 |
|
|
| After |
1 u |
2 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 2 is 2.
Amount that Barbara spent
= 6 u - 1 u
= 5 u
5 u = 350
1 u = 350 ÷ 5 = 70
Amount that Gabby brought along less than Barbara
= 6 u - 2 u
= 4 u
= 4 x 70
= $280
Answer(s): $280
