Irene went shopping with thrice as much money as Tina. After Irene spent $440, Tina had four times as much money as Irene had left. How much less money did Tina bring along for shopping than Irene?
| |
Irene |
Tina |
Difference |
| Before |
3x4 =
12 u |
1x4 =
4 u |
8 u |
| Change |
- $440 |
|
|
| After |
1 u |
4 u |
|
The amount that Tina has remains unchanged at first and in the end. Make the amount that Tina has the same. LCM of 1 and 4 is 4.
Amount that Irene spent
= 12 u - 1 u
= 11 u
11 u = 440
1 u = 440 ÷ 11 = 40
Amount that Tina brought along less than Irene
= 12 u - 4 u
= 8 u
= 8 x 40
= $320
Answer(s): $320
