SOLUTION: Jessica’s house has 4 bedrooms. Each bedroom is 12 feet long, 10 feet wide and 8 feet high. Jessica must paint the walls of all the bedrooms. Doorways and windows, which will not b

Algebra ->  Surface-area -> SOLUTION: Jessica’s house has 4 bedrooms. Each bedroom is 12 feet long, 10 feet wide and 8 feet high. Jessica must paint the walls of all the bedrooms. Doorways and windows, which will not b      Log On


   

Question 841664: Jessica’s house has 4 bedrooms. Each bedroom is 12 feet long, 10 feet wide and 8 feet high. Jessica must paint the walls of all the bedrooms. Doorways and windows, which will not be painted, occupy 65 square feet in each bedroom. How many square feet of walls must be painted ?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Examine for one bedroom first, and then multiply by 4.

Note the description, the WALLS will be painted. This seems to indicate not the cielings and not the floors.

The wall area of a room: 12%2A8%2A2%2B10%2A8%2A2=8%2A2%2812%2B10%29=8%2A2%2A32=highlight_green%28512%29 ft%5E2;
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Not all of that value is actual area or to be painted. We subtract the required 65%2Aft%5E2 from that value:
Actual area of room to paint: 512-65=highlight_green%28447%2Aft%5E2%29.

House has FOUR bedrooms to be painted:
447%2Aft%5E2%2A4=highlight%281788%29 square feet area to paint.