document.write( "Question 998261: How many cubic centimeters of pure hydrochloric acid should be added to 20 cubic centimeters of a 30% solution of hydrochloric acid to obtain a 50% solution? \n" ); document.write( "
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How many cubic centimeters of pure hydrochloric acid should be added to 20 cubic centimeters of a 30% solution of hydrochloric acid to obtain a 50% solution?
\n" ); document.write( "let x=amt of pure hydrochloric acid to add
\n" ); document.write( "30%20+x=50%(30+x)
\n" ); document.write( "6+x=15+.50x
\n" ); document.write( ".50x=9
\n" ); document.write( "x=18
\n" ); document.write( "How many cubic centimeters of pure hydrochloric acid should be added? 18
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