document.write( "Question 809928: What quantity of 40% acid solution must be mixed with 120 mL of 90% acid solution to produce 70% acid solution? \n" ); document.write( "
Algebra.Com's Answer #487935 by richwmiller(17219)\"\" \"About 
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.9*120+.4x=.7(120+x)
\n" ); document.write( "9*120+.4x=.7*120+.7x
\n" ); document.write( ".2*120=.3x
\n" ); document.write( "2*120=3x
\n" ); document.write( "2*40=x
\n" ); document.write( "80 mL=x\r
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