A wall measures 12 feet by 9 feet and contains a door opening 3 feet by 7 feet. How much wall area needs paint?
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Correct!
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Correct answer to question 52 (Arithmetic Reasoning): 87 square feet
Method
Work out the full wall, then take away the opening. The wall is 12 x 9 = 108 square feet and the door is 3 x 7 = 21 square feet, so 108 - 21 = 87 square feet needs paint.
Updated: November 2026
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