document.write( "Question 683927: How much soil containing 55% sand needs to be added to 1m of soil containing 25% sand to make soil containing 35% sand? \n" ); document.write( "

Algebra.Com's Answer #423813 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+x+\"$ = m of soil with 55% sand needed
\n" ); document.write( " $\"+.55x+\"$ = m of sand in 55% soil
\n" ); document.write( " $\"+.25%2A1+=+.25+\"$ m of sand in 25% soil
\n" ); document.write( "--------------
\n" ); document.write( " $\"+%28+.55x+%2B+.25+%29+%2F+%28+x+%2B+1+%29+=+.35+\"$
\n" ); document.write( " $\"+.55x+%2B+.25+=+.35%2A%28+x+%2B+1+%29+\"$
\n" ); document.write( " $\"+.55x+%2B+.25+=+.35x+%2B+.35+\"$
\n" ); document.write( " $\"+.2x+=+.1+\"$
\n" ); document.write( " $\"+x+=+.5+\"$
\n" ); document.write( ".5 m of soil containing 55% sand must be added
\n" ); document.write( "check:
\n" ); document.write( " $\"+%28+.55x+%2B+.25+%29+%2F+%28+.5+%2B+1+%29+=+.35+\"$
\n" ); document.write( " $\"+%28+.55%2A.5+%2B+.25+%29+%2F+1.5+=+.35+\"$
\n" ); document.write( " $\"+.275+%2B+.25+=+1.5%2A.35+\"$
\n" ); document.write( " $\"+.525+=+.525+\"$
\n" ); document.write( "OK\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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