On Wednesday, Tina, Gabby, Dana and Wendy spent a total of $99. On Thursday, Tina spent twice of what she spent on Wednesday, Gabby spent the same as what she spent on Wednesday, Dana spent $17 less than what she spent on Wednesday, and Wendy spent $9 more than what she spent on Wednesday. All of them spent an equal amount on Thursday. How much did Tina and Wendy spend altogether on Wednesday?
|
Tina |
Gabby |
Dana |
Wendy |
Total |
Before |
1 u |
2 u |
2 u + $17 |
2 u - $9 |
$99 |
Change |
x 2 |
|
- $17 |
+ $9 |
|
After |
2 u |
2 u |
2 u |
2 u |
|
Total amount that the four girls spent on Wednesday
= 1 u + 2 u + 2 u + 17 + 2 u - 9
= 7 u + 17 - 9
= 7 u + 8
7 u + 8 = 99
7 u = 99 - 8
7 u = 91
1 u = 91 ÷ 7 = 13
Total amount that Tina and Wendy spent on Wednesday
= 1 u + 2 u - 9
= 3 u - 9
= 3 x 13 - 9
= 39 - 9
= $30
Answer(s): $30