document.write( "Question 159894: how many kilograms of a 30% acid solution must be added to 80kg of a 20% solution to produce a 28% solution? \n" ); document.write( "

Algebra.Com's Answer #117973 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let's call the number X.
\n" ); document.write( " $\"%2830%2F100%29X%2B%2820%2F100%29%2880%29=%2828%2F100%29%28X%2B80%29\"$
\n" ); document.write( " $\"30X%2B1600=28%28X%2B80%29\"$
\n" ); document.write( " $\"30X%2B1600=28X%2B2240\"$
\n" ); document.write( " $\"2X=640\"$
\n" ); document.write( " $\"X=320\"$
\n" ); document.write( "320 kg of 30% solution is needed. \n" ); document.write( "

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