document.write( "Question 266828: how many quarts of pure antifreeze must be added to 4 quarts of a 10% antifreeze solution to obtain a 20% antifreeze solution? \n" ); document.write( "

Algebra.Com's Answer #196110 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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how many quarts of pure antifreeze must be added to 4 quarts of a 10% antifreeze solution to obtain a 20% antifreeze solution?
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\n" ); document.write( "Let x = amt of pure antifreeze required
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\n" ); document.write( "Write a decimal equiv mixture equation (pure antifreeze is 100% or 1x)
\n" ); document.write( ".10(4) + x = .20(x + 4)
\n" ); document.write( ".4 + x = .2x + .8
\n" ); document.write( "x - .2x = .8 - .4
\n" ); document.write( ".8x = .4
\n" ); document.write( "x = $\".4%2F.8\"$
\n" ); document.write( "x = .5, half a quart of pure antifreeze required \n" ); document.write( "

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