document.write( "Question 909956: I need 90 milliliters of a 20% solution but only have 4% and 40% solutions available. how many many milliliters of each should be mixed to get my desired solution? \n" ); document.write( "
Algebra.Com's Answer #552140 by ewatrrr(24785)\"\" \"About 
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x 40% amount
\n" ); document.write( ".40x + .04(90ml - x) = .20(90ml)
\n" ); document.write( "x = .16(90ml)/.36, 40% amount
\n" ); document.write( "\"90-x\" the 4% amount
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