document.write( "Question 768077: At coffee house, man wanted 300ml of coffee. To this coffee he wanted pure cream added until the cream represents 20% of the total volume of the drink( cream and coffee. Not just 20% of the 300ml). How much pure cream should be added? \n" ); document.write( "
Algebra.Com's Answer #468040 by josgarithmetic(39799)\"\" \"About 
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f is volume of cofFee
\n" ); document.write( "r is volume of cReam
\n" ); document.write( "total volume of both together = f+r.
\n" ); document.write( "want 0.20 cream/(cream&coffee)\r
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\n" ); document.write( "\n" ); document.write( "\"r%2F%28f%2Br%29=0.2\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Now, f=300 ml. and r is unknown. Find r.
\n" ); document.write( "\"r=0.2%28f%2Br%29\"
\n" ); document.write( "\"r=0.2f%2B0.2r\"
\n" ); document.write( "\"r-0.2r=0.2f\"
\n" ); document.write( "\"r%281-0.2%29=0.2f\"
\n" ); document.write( "\"0.8r=0.2f\"
\n" ); document.write( "\"highlight%28r=%281%2F4%29f%29\"
\n" ); document.write( "\"highlight%28r=300%2F4=75%29\" ml. of cream
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