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

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One gallon of paint will cover $70$ square feet of a surface. A room has a total wall area of $w$ square feet. Which equation represents the total amount of paint $P$, in gallons, needed to paint the walls of the room twice?

A

$P=\frac{w}{70}$

B

$P=70w$

C

$P=140w$

D

$P=\frac{w}{35}$