Kathy went shopping with thrice as much money as Erika. After Kathy spent $450, Erika had twice as much money as Kathy had left. How much more money did Kathy bring along for shopping than Erika?
| |
Kathy |
Erika |
Difference |
| Before |
3x2 =
6 u |
1x2 =
2 u |
4 u |
| Change |
- $450 |
|
|
| After |
1 u |
2 u |
|
The amount that Erika has remains unchanged at first and in the end. Make the amount that Erika has the same. LCM of 1 and 2 is 2.
Amount that Kathy spent
= 6 u - 1 u
= 5 u
5 u = 450
1 u = 450 ÷ 5 = 90
Amount that Kathy brought along more than Erika
= 6 u - 2 u
= 4 u
= 4 x 90
= $360
Answer(s): $360
