On Monday, Diana, Esther, Cindy and Lynn spent a total of $115. On Tuesday, Diana spent twice of what she spent on Monday, Esther spent the same as what she spent on Monday, Cindy spent $19 less than what she spent on Monday, and Lynn spent $2 more than what she spent on Monday. All of them spent an equal amount on Tuesday. How much did Diana and Lynn spend altogether on Monday?
| |
Diana |
Esther |
Cindy |
Lynn |
Total |
| Before |
1 u |
2 u |
2 u + $19 |
2 u - $2 |
$115 |
| Change |
x 2 |
|
- $19 |
+ $2 |
|
| After |
2 u |
2 u |
2 u |
2 u |
|
Total amount that the four girls spent on Monday
= 1 u + 2 u + 2 u + 19 + 2 u - 2
= 7 u + 19 - 2
= 7 u + 17
7 u + 17 = 115
7 u = 115 - 17
7 u = 98
1 u = 98 ÷ 7 = 14
Total amount that Diana and Lynn spent on Monday
= 1 u + 2 u - 2
= 3 u - 2
= 3 x 14 - 2
= 42 - 2
= $40
Answer(s): $40
