document.write( "Question 802465: i was delivered 500 gallons of sodium hydroxide 50% solution how much water needs to be added to get a 40% concentrate \n" ); document.write( "

Algebra.Com's Answer #483925 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+w+\"$ = gallons of water to be added
\n" ); document.write( " $\"+.5%2A500+=+250+\"$ gallons of sodium hydroxide
\n" ); document.write( "-----------------
\n" ); document.write( " $\"+250+%2F+%28+500+%2B+w+%29+=+.4+\"$
\n" ); document.write( " $\"+250+=+.4%2A%28+500+%2B+w+%29+\"$
\n" ); document.write( " $\"+250+=+200+%2B+.4w+\"$
\n" ); document.write( " $\"+.4w+=+50+\"$
\n" ); document.write( " $\"+w+=+125+\"$
\n" ); document.write( "125 gallons of water must be added\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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