document.write( "Question 924793: How much 25% solution must be added to 42 cc of pure water to make at most 20% salt solution? \n" ); document.write( "

Algebra.Com's Answer #561082 by rothauserc(4718) $\"\"$ $\"About$

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let x be the amount of 25% solution to add to the 42 cc of pure water, then we have the following table:
\n" ); document.write( "x .25 .25x
\n" ); document.write( "42 .00 0
\n" ); document.write( "x+42 .20 .20(x+42)
\n" ); document.write( "from the last column we have the following formula
\n" ); document.write( ".25x = .20(x+42)
\n" ); document.write( ".25x = .20x + 8.40
\n" ); document.write( ".05x = 8.40
\n" ); document.write( "x = 168 cc of 25% solution to be added to the 42 cc of pure water
\n" ); document.write( " \n" ); document.write( "

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