document.write( "Question 1055407: James wishes to obtain 800 mL of a 7% solution of boric acid by mixing 4% and 12% solutions. How much of each should be used? \n" ); document.write( "

Algebra.Com's Answer #670625 by MathTherapy(10552) $\"\"$ $\"About$

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James wishes to obtain 800 mL of a 7% solution of boric acid by mixing 4% and 12% solutions. How much of each should be used?
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Let amount of 4% solution to mix, be F
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document.write( "Then amount of 12% solution to mix is: 800 - F
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document.write( "The following equation is thus formed: .04F + .12(800 - F) = .07(800)
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document.write( ".04F + 96 - .12F = 56
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document.write( ".04F - .12F = 56 - 96
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document.write( "- .08F = - 40
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