On Wednesday, Tammy, Emily, Lucy and Olivia spent a total of $144. On Thursday, Tammy spent twice of what she spent on Wednesday, Emily spent the same as what she spent on Wednesday, Lucy spent $13 less than what she spent on Wednesday, and Olivia spent $9 more than what she spent on Wednesday. All of them spent an equal amount on Thursday. How much did Tammy and Olivia spend altogether on Wednesday?
|
Tammy |
Emily |
Lucy |
Olivia |
Total |
Before |
1 u |
3 u |
3 u + $13 |
3 u - $9 |
$144 |
Change |
x 3 |
|
- $13 |
+ $9 |
|
After |
3 u |
3 u |
3 u |
3 u |
|
Total amount that the four girls spent on Wednesday
= 1 u + 3 u + 3 u + 13 + 3 u - 9
= 10 u + 13 - 9
= 10 u + 4
10 u + 4 = 144
10 u = 144 - 4
10 u = 140
1 u = 140 ÷ 10 = 14
Total amount that Tammy and Olivia spent on Wednesday
= 1 u + 3 u - 9
= 4 u - 9
= 4 x 14 - 9
= 56 - 9
= $47
Answer(s): $47