document.write( "Question 824153: Determine the number of cans of paint needed to paint three rooms of a house (walls and ceiling). Each room is 12 feet by 10 feet with 8 foot ceilings. Each room contains a 4 foot by 5 foot window and a 3 foot by 7 foot door. A can of paint is 1 gallon and covers 250 square feet.\r
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Algebra.Com's Answer #496129 by josgarithmetic(39617)\"\" \"About 
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Surface Area of a room:
\n" ); document.write( "\"2%2812%2A8%29%2B2%2810%2A8%29%2B12%2A10\" ignoring the door and window.
\n" ); document.write( "Accounting for the door and window, room area needing paint is \"%2812%2A8%29%2B2%2810%2A8%29%2B12%2A10-%284%2A5%2B3%2A7%29\" square feet.\r
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\n" ); document.write( "\n" ); document.write( "A specific answer requires knowing the number of these rooms. Let r = how many rooms like this need painting.\r
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\n" ); document.write( "\n" ); document.write( "Surface area to paint for the r rooms is \"r%28%2812%2A8%29%2B2%2810%2A8%29%2B12%2A10-%284%2A5%2B3%2A7%29%29\"\r
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\n" ); document.write( "\n" ); document.write( "How many gallons of paint needed,
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