document.write( "Question 370043: I have one solution of 70% acid 30% water and another that is 20% acid 80% water. How much of each would I need to attain 5 ounces of 65% acid 35% water. \n" ); document.write( "
Algebra.Com's Answer #263683 by Fombitz(32388)\"\" \"About 
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Let A be the amount of 70% solution, B the amount of 20% solution.
\n" ); document.write( "Volume:
\n" ); document.write( "1.\"A%2BB=5\"
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\n" ); document.write( "Concentration:
\n" ); document.write( "\"70A%2B20B=65%285%29\"
\n" ); document.write( "2.\"14A%2B4B=65\"
\n" ); document.write( "Multiply eq. 1 by (-4) and add to eq. 2,
\n" ); document.write( "\"-4A-4B%2B14A%2B4B=20%2B65\"
\n" ); document.write( "\"10A=85\"
\n" ); document.write( "\"A=85%2F10\"
\n" ); document.write( "\"highlight%28A=17%2F5%29\" ounces
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\n" ); document.write( "Then from eq. 1,
\n" ); document.write( "\"17%2F5%2BB=5\"
\n" ); document.write( "\"highlight%28B=8%2F5%29\" ounces
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