On Friday, Jen, Zoe, Kimberly and Irene spent a total of $80. On Saturday, Jen spent twice of what she spent on Friday, Zoe spent the same as what she spent on Friday, Kimberly spent $5 less than what she spent on Friday, and Irene spent $2 more than what she spent on Friday. All of them spent an equal amount on Saturday. How much did Jen and Irene spend altogether on Friday?
|
Jen |
Zoe |
Kimberly |
Irene |
Total |
Before |
1 u |
2 u |
2 u + $5 |
2 u - $2 |
$80 |
Change |
x 2 |
|
- $5 |
+ $2 |
|
After |
2 u |
2 u |
2 u |
2 u |
|
Total amount that the four girls spent on Friday
= 1 u + 2 u + 2 u + 5 + 2 u - 2
= 7 u + 5 - 2
= 7 u + 3
7 u + 3 = 80
7 u = 80 - 3
7 u = 77
1 u = 77 ÷ 7 = 11
Total amount that Jen and Irene spent on Friday
= 1 u + 2 u - 2
= 3 u - 2
= 3 x 11 - 2
= 33 - 2
= $31
Answer(s): $31