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Math·Problem-Solving and Data Analysis·Ratios, rates, proportional relationships, and units

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One gallon of paint costs $18 and will cover 350 square feet of a surface. A deck has a total surface area of $d$ square feet. Which equation represents the cost $x$, in dollars, of the paint needed to cover this deck?

A

$x=\frac{d}{350}$

B

$x=\frac{350}{d}$

C

$x=18\cdot \frac{350}{d}$

D

$x=18\cdot \frac{d}{350}$