document.write( "Question 830185: I have 100 gallons of 70% solution. I need to mix it with a 90% solution to obtain a 75% solution. How much 90% do I need? \n" ); document.write( "

Algebra.Com's Answer #500391 by TimothyLamb(4379) $\"\"$ $\"About$

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\n" ); document.write( "70*100 + 90x = 75(x + 100)
\n" ); document.write( "7000 + 90x = 75x + 7500
\n" ); document.write( "15x = 500
\n" ); document.write( "x = 500/15
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\n" ); document.write( "answer
\n" ); document.write( "mix 33.333 gallons of 90% solution
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