On Monday, Jane, Min, Elyse and Mary spent a total of $112. On Tuesday, Jane spent twice of what she spent on Monday, Min spent the same as what she spent on Monday, Elyse spent $15 less than what she spent on Monday, and Mary spent $8 more than what she spent on Monday. All of them spent an equal amount on Tuesday. How much did Jane and Mary spend altogether on Monday?
| |
Jane |
Min |
Elyse |
Mary |
Total |
| Before |
1 u |
2 u |
2 u + $15 |
2 u - $8 |
$112 |
| Change |
x 2 |
|
- $15 |
+ $8 |
|
| After |
2 u |
2 u |
2 u |
2 u |
|
Total amount that the four girls spent on Monday
= 1 u + 2 u + 2 u + 15 + 2 u - 8
= 7 u + 15 - 8
= 7 u + 7
7 u + 7 = 112
7 u = 112 - 7
7 u = 105
1 u = 105 ÷ 7 = 15
Total amount that Jane and Mary spent on Monday
= 1 u + 2 u - 8
= 3 u - 8
= 3 x 15 - 8
= 45 - 8
= $37
Answer(s): $37
