On Friday, Wendy, Tina, Anna and Lynn spent a total of $128. On Saturday, Wendy spent twice of what she spent on Friday, Tina spent the same as what she spent on Friday, Anna spent $20 less than what she spent on Friday, and Lynn spent $12 more than what she spent on Friday. All of them spent an equal amount on Saturday. How much did Wendy and Lynn spend altogether on Friday?
| |
Wendy |
Tina |
Anna |
Lynn |
Total |
| Before |
1 u |
3 u |
3 u + $20 |
3 u - $12 |
$128 |
| Change |
x 3 |
|
- $20 |
+ $12 |
|
| After |
3 u |
3 u |
3 u |
3 u |
|
Total amount that the four girls spent on Friday
= 1 u + 3 u + 3 u + 20 + 3 u - 12
= 10 u + 20 - 12
= 10 u + 8
10 u + 8 = 128
10 u = 128 - 8
10 u = 120
1 u = 120 ÷ 10 = 12
Total amount that Wendy and Lynn spent on Friday
= 1 u + 3 u - 12
= 4 u - 12
= 4 x 12 - 12
= 48 - 12
= $36
Answer(s): $36
