document.write( "Question 227894: how much water should you add to 150 ml of a 25% salt solution to make the solution 15% salt? \n" ); document.write( "

Algebra.Com's Answer #169285 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"w\"$ = ml of water to be added
\n" ); document.write( "In words:
\n" ); document.write( "(final ml of salt)/(final ml of salt + water) = 125%
\n" ); document.write( "Initially I have:
\n" ); document.write( " $\".25%2A150+=+37.5\"$ ml salt in solution
\n" ); document.write( "I can now write my equation:
\n" ); document.write( " $\"37.5%2F%28150+%2B+w%29+=+.15\"$
\n" ); document.write( "Multiply both sides by $\"150+%2B+w\"$
\n" ); document.write( " $\"37.5+=+.15%2A%28150+%2B+w%29\"$
\n" ); document.write( " $\"37.5+=+22.5+%2B+.15w\"$
\n" ); document.write( " $\".15w+=+15\"$
\n" ); document.write( " $\"w+=+100\"$ ml
\n" ); document.write( "100 ml of water needs to be added
\n" ); document.write( "check:
\n" ); document.write( " $\"37.5%2F%28150+%2B+w%29+=+.15\"$
\n" ); document.write( " $\"37.5%2F%28150+%2B+100%29+=+.15\"$
\n" ); document.write( " $\"37.5%2F250+=+.15\"$
\n" ); document.write( " $\"37.5+=+.15%2A250\"$
\n" ); document.write( " $\"37.5+=+37.5\"$
\n" ); document.write( "OK \n" ); document.write( "

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