document.write( "Question 551089: How much soil containing 45% sand do you need to add to 1ft.of soil containing 15% sand in order to make a soil containing 35% sand? \n" ); document.write( "

Algebra.Com's Answer #359392 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"+x+\"$ = ft of 45% soil needed
\n" ); document.write( " $\"+.45x+\"$ = ft of sand in 45% soil
\n" ); document.write( " $\"+.15%2A1+\"$ = ft of sand in 15% soil
\n" ); document.write( "--------------------------
\n" ); document.write( " $\"+%28+.45x+%2B+.15+%29+%2F+%28+1+%2B+x+%29+=+.35+\"$
\n" ); document.write( " $\"+.45x+%2B+.15+=+.35%2A%28+1+%2B+x+%29+\"$
\n" ); document.write( " $\"+.45x+%2B+.15+=+.35+%2B+.35x+\"$
\n" ); document.write( " $\"+.45x+-+.35x+=+.35+-+.15+\"$
\n" ); document.write( " $\"+.1x+=+.2+\"$
\n" ); document.write( " $\"+x+=+2+\"$
\n" ); document.write( "2 ft of soil containing 45% sand is needed
\n" ); document.write( "check answer:
\n" ); document.write( " $\"+%28+.45%2A2+%2B+.15+%29+%2F+%28+1+%2B+2+%29+=+.35+\"$
\n" ); document.write( " $\"+%28+.9+%2B+.15+%29+%2F+3+=+.35+\"$
\n" ); document.write( " $\"+1.05+=+1.05+\"$
\n" ); document.write( "OK\r
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