On Monday, Anna, Erika, Eva and Linda spent a total of $137. On Tuesday, Anna spent twice of what she spent on Monday, Erika spent the same as what she spent on Monday, Eva spent $5 less than what she spent on Monday, and Linda spent $1 more than what she spent on Monday. All of them spent an equal amount on Tuesday. How much did Anna and Linda spend altogether on Monday?
| |
Anna |
Erika |
Eva |
Linda |
Total |
| Before |
1 u |
2 u |
2 u + $5 |
2 u - $1 |
$137 |
| Change |
x 2 |
|
- $5 |
+ $1 |
|
| After |
2 u |
2 u |
2 u |
2 u |
|
Total amount that the four girls spent on Monday
= 1 u + 2 u + 2 u + 5 + 2 u - 1
= 7 u + 5 - 1
= 7 u + 4
7 u + 4 = 137
7 u = 137 - 4
7 u = 133
1 u = 133 ÷ 7 = 19
Total amount that Anna and Linda spent on Monday
= 1 u + 2 u - 1
= 3 u - 1
= 3 x 19 - 1
= 57 - 1
= $56
Answer(s): $56
