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Answer:
$276
Step-by-step explanation:
Create a proportion where x is the cost to refinish the larger wood floor:
= 
Cross multiply and solve for x:
3x = 828
x = 276
So, to refinish the larger wood floor, it would cost $276
Answer:
a+b
Step-by-step explanation:
=1a+1b
=1(a+b)
=a+b
7 times 6 is 42
91 divided by 7 is 13