document.write( "Question 315380: a chemist has 600 ml of a solution that is half acid. she needs 70% oof acid. how much acid should she add? \n" ); document.write( "

Algebra.Com's Answer #225663 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"x\"$ = ml of acid to be added
\n" ); document.write( "In words:
\n" ); document.write( "(final ml of acid)/(total ml of solution) = 70%
\n" ); document.write( " $\"%28300+%2B+x%29%2F%28600+%2B+x%29+=+.7\"$
\n" ); document.write( " $\"300+%2B+x+=+.7%2A%28600+%2B+x%29\"$
\n" ); document.write( " $\"300+%2B+x+=+420+%2B+.7x\"$
\n" ); document.write( " $\"x+-+.7x+=+420+-+300\"$
\n" ); document.write( " $\".3x+=+120\"$
\n" ); document.write( " $\"x+=+400\"$
\n" ); document.write( "She must add 400 ml of acid \n" ); document.write( "

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