document.write( "Question 370252: black pencils sell at two for 15 cents, and red pencils sell at 10 cents each. How many of each kind were sold if a total of 25 were sold for $2.00? \n" ); document.write( "

Algebra.Com's Answer #263895 by mananth(16946) $\"\"$ $\"About$

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black pencils sell at two for 15 cents, and red pencils sell at 10 cents each. How many of each kind were sold if a total of 25 were sold for $2.00?
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\n" ); document.write( "black pencils two for 15 cents,
\n" ); document.write( "so 1 for 7.5 cents
\n" ); document.write( "red pencils 10 cents each.
\n" ); document.write( " total of 25 were sold
\n" ); document.write( "for $2.00 = 200 cents
\n" ); document.write( "...
\n" ); document.write( "let black pencils be x numbers
\n" ); document.write( "red pencils will be 25-x
\n" ); document.write( "..
\n" ); document.write( "cost of black pencils = 7.5x
\n" ); document.write( "cost of red penci;s = 10(25-x)
\n" ); document.write( "..
\n" ); document.write( "7.5x+10(25-x)=200
\n" ); document.write( "7.5x+250-10x= 200
\n" ); document.write( "-2.5x=-250+200
\n" ); document.write( "-2.5x=-50
\n" ); document.write( "/-2.5
\n" ); document.write( "x= -50/-2.5
\n" ); document.write( "x=20 pencils ---- black
\n" ); document.write( "5 will be red
\n" ); document.write( "...
\n" ); document.write( "m.ananth@hotmail.ca
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