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smc

geometry senior

Problem

Isabella's house has bedrooms. Each bedroom is feet long, feet wide, and feet high. Isabella must paint the walls of all the bedrooms. Doorways and windows, which will not be painted, occupy square feet in each bedroom. How many square feet of walls must be painted?
(A)
(B)
(C)
(D)
(E)
Solution
There are four walls in each bedroom (she can't paint floors or ceilings). Therefore, we calculate the number of square feet of walls there is in one bedroom: We have three bedrooms, so she must paint square feet of walls.
Final answer
E