$\"\"$

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Henry is painting a room with four walls that are $\"\"$ feet by $\"\"$ feet.

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A gallon of paint costs $\"\"$ and covers $\"\"$ square feet.

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If he uses two coats of pain find the cost of room.

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Find the area of the wall.

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Area of the wall is $\"\"$

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$\"\"$ (Substitute $\"\"$ and $\"\"$ )

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$\"\"$ (Simplify)

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Area of the four wall is $\"\"$ .

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$\"\"$ (Multiply each side by $\"\"$ )

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$\"\"$ (Simplify)

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Find the cost of the painting room.

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$\"\"$ (Original proportion)

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$\"\"$ (Find the cross products)

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$\"\"$ (Simplify)

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$\"\"$ (Divide each side by $\"\"$ )

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$\"\"$ (Cancel common terms)

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The cost of the painting room is $\"\"$ .

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$\"\"$

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The cost of the painting room is $\"\"$ .