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Bunuel
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We need to find the total amount spent by Suzy and Dave.

Option 1:
Dave spends 100$ more than Suzy
D=S+100
From here we can't say the total amount spent by them , Hence not sufficient
Option 2:
7s=6D from here also we can't find the individual values of D and S not sufficient

Option 1+2
D=s+100
7S=6D
7S=6(s+100)
7S=6S+600
S=600
D=700
So option C is correct
Bunuel
If Suzy spends s dollars each month and Dave spends d dollars each month, what is the total amount they together spend per month?

(1) Dave spends $100 more per month than Suzy spends per month.
(2) It takes Suzy seven months to spend the same amount that Dave spends in six months.


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