document.write( "Question 402591: If three gallons of grade A oil are mixed with seven gal of grade B oil the resulting mixture is worth 43 cents per gal. However, if three gal of grade A oil are mixed with two gal of grade B oil the resulting mixture is worth 46 cents per gal. Find the price per gallon of each grade. \n" ); document.write( "
Algebra.Com's Answer #285019 by scott8148(6628)\"\" \"About 
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3A + 7B = 10(.43)\r
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\n" ); document.write( "\n" ); document.write( "3A + 2B = 5(.46)\r
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\n" ); document.write( "\n" ); document.write( "subtracting equations (eliminating A) ___ 5B = 2.00 ___ B = .40\r
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\n" ); document.write( "\n" ); document.write( "substitute to find A
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