On Saturday, Cathy, Gabby, Jen and Kimberly spent a total of $145. On Sunday, Cathy spent twice of what she spent on Saturday, Gabby spent the same as what she spent on Saturday, Jen spent $20 less than what she spent on Saturday, and Kimberly spent $1 more than what she spent on Saturday. All of them spent an equal amount on Sunday. How much did Cathy and Kimberly spend altogether on Saturday?
|
Cathy |
Gabby |
Jen |
Kimberly |
Total |
Before |
1 u |
2 u |
2 u + $20 |
2 u - $1 |
$145 |
Change |
x 2 |
|
- $20 |
+ $1 |
|
After |
2 u |
2 u |
2 u |
2 u |
|
Total amount that the four girls spent on Saturday
= 1 u + 2 u + 2 u + 20 + 2 u - 1
= 7 u + 20 - 1
= 7 u + 19
7 u + 19 = 145
7 u = 145 - 19
7 u = 126
1 u = 126 ÷ 7 = 18
Total amount that Cathy and Kimberly spent on Saturday
= 1 u + 2 u - 1
= 3 u - 1
= 3 x 18 - 1
= 54 - 1
= $53
Answer(s): $53