document.write( "Question 896214: A printer has ink that is 7% cobalt blue color and ink that is 23% cobalt blue color. How many ounces of each ink are needed to make 1 gallon (128 ounces) of ink that is 15% cobalt blue color?
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Algebra.Com's Answer #543379 by richwmiller(17219)\"\" \"About 
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a+b=128,
\n" ); document.write( ".07a+.23*b=.15*128
\n" ); document.write( "a=64, b=64
\n" ); document.write( "Equal amounts of 7% and 23%\r
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\n" ); document.write( ".07*64+.23*64=.15*128
\n" ); document.write( "4.48+14.72=19.20
\n" ); document.write( "19.20=19.20
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