document.write( "Question 508398: The dosage of a medicine ordered by a doctor is 40 mL of a 16% solution. A nurse has available both a 20% solution and a 4% solution of this medicine. How many milliliters of each could be mixed to prepare this 40-mL dosage? \n" ); document.write( "
Algebra.Com's Answer #341025 by Maths68(1474)\"\" \"About 
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\n" ); document.write( "Solution A
\n" ); document.write( "Amount = x
\n" ); document.write( "Concentration = 20% = 0.2
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\n" ); document.write( "Solution B
\n" ); document.write( "Amount = 40-x
\n" ); document.write( "Concentration = 4% = 0.04
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\n" ); document.write( "Resultant Solution
\n" ); document.write( "Amount = 40
\n" ); document.write( "Concentration = 16% = 0.16
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\n" ); document.write( "(Concentration of A)(Amount of A) + (Concentration of B)(Amount of B) = Concentration of Resultant)(Amount of Resultant)\r
\n" ); document.write( "\n" ); document.write( "(0.2)(x)+((0.04)(40-x))=(.16)(40)
\n" ); document.write( "0.16x+1.6=6.4
\n" ); document.write( "0.16x=6.4-1.6
\n" ); document.write( "0.16x=4.8
\n" ); document.write( "0.16x/0.16=4.8/0.16
\n" ); document.write( "x=30
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\n" ); document.write( "Solution A = 30ml
\n" ); document.write( "Solution B = 40-30=10ml\r
\n" ); document.write( "\n" ); document.write( "To get 40 ml of a 16% solution. 30 ml of 20% solution and a 10ml of 4% solution could be mixed\r
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