document.write( "Question 893927: Madison is making a vinaigrette for her catering service using olive oil that costs forty cents per ounce and apple cider vinegar that costs twenty-five cents an ounce. The ideal batch of vinaigrette has 25% vinegar. If she has already combined 3 cups of vinegar and 1 cup of oil, how many cups of oil should she add? What is the total cost of her completed recipe? \n" ); document.write( "
Algebra.Com's Answer #541629 by josgarithmetic(39618)\"\" \"About 
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Not \"ounce\"; instead, \"FLUID OUNCE\". The measures are by volume.
\n" ); document.write( "1 cup = 8 fluid ounces\r
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\n" ); document.write( "\n" ); document.write( "Olive Oil, 40 cents per fl. oz.
\n" ); document.write( "Vinegar, 25 cents per fl. oz.
\n" ); document.write( "Wanted, 25% Vinegar.\r
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\n" ); document.write( "\n" ); document.write( "Already present: 3 cups vinegar, 1 cup olive oil.\r
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\n" ); document.write( "\n" ); document.write( "How much oil to add?
\n" ); document.write( "\"3%283%2B1%2Bx%29=0.25\", using x for how many cups of olive oil to add.
\n" ); document.write( "\"3%2F%28x%2B4%29=0.25\"
\n" ); document.write( "\"3=%281%2F4%29%28x%2B4%29\"
\n" ); document.write( "\"12=x%2B4\"
\n" ); document.write( "\"x=8\", Add 8 cups of oil.\r
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\n" ); document.write( "\n" ); document.write( "Cost of this vinegarette?
\n" ); document.write( "3 cups vinegar + 9 cups oil. This is 12 cups.\r
\n" ); document.write( "\n" ); document.write( "\"3%2A8%2A40%2B9%2A8%2A25=24%2840%2B25%29=24%2A65\" cents
\n" ); document.write( "\"1560\" cents
\n" ); document.write( "$15.60
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