document.write( "Question 541397: how many kilograms of salt must be added to 35kg of a 15% salt solution to make a 25% salt solution? \n" ); document.write( "

Algebra.Com's Answer #354172 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+x+\"$ = kg of salt needed
\n" ); document.write( "given:
\n" ); document.write( " $\"+.15%2A35+=+5.25+\"$ kg of salt in 15% solution
\n" ); document.write( "In words:
\n" ); document.write( "( total kg of salt ) / ( total kg of solution ) = 25%
\n" ); document.write( " $\"+%285.25+%2B+x%29+%2F+%2835+%2B+x%29+=+.25+\"$
\n" ); document.write( " $\"+5.25+%2B+x+=+.25%2A%28+35+%2B+x+%29+\"$
\n" ); document.write( " $\"+5.25+%2B+x+=+8.75+%2B+.25x+\"$
\n" ); document.write( " $\"+.75x+=+8.75+-+5.25+\"$
\n" ); document.write( " $\"+.75x+=+3.5+\"$
\n" ); document.write( " $\"+x+=+3.5+%2F+.75+\"$
\n" ); document.write( " $\"+x+=+4.667+\"$
\n" ); document.write( "4.667 kg of salt must be added
\n" ); document.write( "check:
\n" ); document.write( " $\"+%285.25+%2B+x%29+%2F+%2835+%2B+x%29+=+.25+\"$
\n" ); document.write( " $\"+%285.25+%2B+4.667%29+%2F+%2835+%2B+4.667%29+=+.25+\"$
\n" ); document.write( " $\"+9.917+%2F+39.667+=+.25+\"$
\n" ); document.write( " $\"+9.917+=+.25%2A39.667+\"$
\n" ); document.write( " $\"+9.917+=+9.9167+\"$
\n" ); document.write( "looks OK\r
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