Gabby went shopping with twice as much money as Anna. After Gabby spent $150, Anna had thrice as much money as Gabby had left. How much less money did Anna bring along for shopping than Gabby?
| |
Gabby |
Anna |
Difference |
| Before |
2x3 =
6 u |
1x3 =
3 u |
3 u |
| Change |
- $150 |
|
|
| After |
1 u |
3 u |
|
The amount that Anna has remains unchanged at first and in the end. Make the amount that Anna has the same. LCM of 1 and 3 is 3.
Amount that Gabby spent
= 6 u - 1 u
= 5 u
5 u = 150
1 u = 150 ÷ 5 = 30
Amount that Anna brought along less than Gabby
= 6 u - 3 u
= 3 u
= 3 x 30
= $90
Answer(s): $90
