document.write( "Question 570943: What quantity of a 55% acid solution must be mixed with a 25% solution to produce 400 mL of a 40% solution? \n" ); document.write( "
Algebra.Com's Answer #367871 by Maths68(1474)\"\" \"About 
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Solution A
\n" ); document.write( "Amount = x
\n" ); document.write( "Concentration = 55%=0.55
\n" ); document.write( "Solution B
\n" ); document.write( "Amount = 400-x
\n" ); document.write( "Concentration = 25%=0.25
\n" ); document.write( "Resultant Solution
\n" ); document.write( "Amount = 400
\n" ); document.write( "Concentration = 40% =0.4\r
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\n" ); document.write( "\n" ); document.write( "(Amount of A)(concentration of A)+ (Amount of B)(concentration of B)= (Amount of resultant)(concentration of resultant)
\n" ); document.write( "(x)(0.55)+(400-x)(0.25)=(400)(0.4)
\n" ); document.write( "0.55x+100-0.25x=160
\n" ); document.write( "0.55x-0.25x=160-100
\n" ); document.write( "0.3x=60
\n" ); document.write( "0.3x/0.3=60/0.3
\n" ); document.write( "x=200\r
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\n" ); document.write( "\n" ); document.write( "200ml of a 55% acid solution must be mixed with a 200ml of 25% solution to produce 400 mL of a 40% solution\r
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