document.write( "Question 581415: Okay I'm stumped on this problem. I have tried to figure out the equation but I keep geting stuck. The problem is: \"A chemist has a 90% solution of sulfuric acid and a 70% solution of the same acid. How many gallons of each must be mixed in order to make 200 gallons of 75% solution?\"
\n" ); document.write( "Here's what I know: I know that x is the amount of the 90% solution and that y would be the amount of the 70% solution. I think that the equation would be .90x + .70y = .75 and that the other equation is x+y=200. but I am not sure I did that right and I keep getting fractions as my answer. Help please. \n" ); document.write( "

Algebra.Com's Answer #371665 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

You can put this solution on YOUR website!
\"A chemist has a 90% solution of sulfuric acid and a 70% solution of the same acid.
\n" ); document.write( " How many gallons of each must be mixed in order to make 200 gallons of 75% solution?\"
\n" ); document.write( ":
\n" ); document.write( "We can do it this way
\n" ); document.write( ":
\n" ); document.write( "Let x = amt of 90% solution
\n" ); document.write( "the resulting amt is to be 200 gal, therefore
\n" ); document.write( "(200-x) = amt of 70% solution
\n" ); document.write( ":
\n" ); document.write( ".90x + .70(200-x) = .75(200)
\n" ); document.write( "solve for x, to get the 90% amt, then subtract that from 200 to get the 70% \n" ); document.write( "

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