document.write( "Question 885664: How many gallons of a 12%-salt solution must be mixed with 6 gallons of a 20%-salt solution to obtain a 15%-salt solution? \n" ); document.write( "
Algebra.Com's Answer #535331 by Theo(13342)\"\" \"About 
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.12x + .2*6 = .15*(x+6)
\n" ); document.write( "simplify to get:
\n" ); document.write( ".12x + 1.2 = .15x + .9
\n" ); document.write( "subtract .9 from both sides of the equation and subtract .12x from both sides of the equation to get:
\n" ); document.write( "1.2 - .9 = .15x - .12x
\n" ); document.write( "simplify to get:
\n" ); document.write( ".3 = -.03x
\n" ); document.write( "divide both sides of this equation by -.03 to get:
\n" ); document.write( "x = 10
\n" ); document.write( "that should be your answer.
\n" ); document.write( "replace x in your original equation with 10 to see if that's right.
\n" ); document.write( ".12x + .2*6 = .15*(x+6) becomes:
\n" ); document.write( ".12*10 + .2*6 = .15*16
\n" ); document.write( "simplify this to get:
\n" ); document.write( "1.2 + 1.2 = 1.5 + .9
\n" ); document.write( "simplify further by combining like terms to get:
\n" ); document.write( "2.4 = 2.4
\n" ); document.write( "this is correct so the answer is good.
\n" ); document.write( "10 gallons of a 12% salt solution must be mixed with 6 gallons of a 20% salt solution to get 16 gallons of a 15% solution.\r
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