On Monday, Jade, Joelle, Lucy and Zoe spent a total of $109. On Tuesday, Jade spent twice of what she spent on Monday, Joelle spent the same as what she spent on Monday, Lucy spent $13 less than what she spent on Monday, and Zoe spent $9 more than what she spent on Monday. All of them spent an equal amount on Tuesday. How much did Jade and Zoe spend altogether on Monday?
| |
Jade |
Joelle |
Lucy |
Zoe |
Total |
| Before |
1 u |
2 u |
2 u + $13 |
2 u - $9 |
$109 |
| Change |
x 2 |
|
- $13 |
+ $9 |
|
| After |
2 u |
2 u |
2 u |
2 u |
|
Total amount that the four girls spent on Monday
= 1 u + 2 u + 2 u + 13 + 2 u - 9
= 7 u + 13 - 9
= 7 u + 4
7 u + 4 = 109
7 u = 109 - 4
7 u = 105
1 u = 105 ÷ 7 = 15
Total amount that Jade and Zoe spent on Monday
= 1 u + 2 u - 9
= 3 u - 9
= 3 x 15 - 9
= 45 - 9
= $36
Answer(s): $36
