document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=612114>Question 612114</A>: <I><SPAN STYLE=\"word-break: break-all;\"> This has me so confussed!\r<BR>\n" );
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document.write( "Mary knows that a used Biology book may costs about half as much as a new one.   She bought a used Biology Book for $90.00.  Which equation could be used to find P, the price of Mary's book if she had bought a new one?\r<BR>\n" );
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document.write( "A.)  p - 1/2 = 90   B.)  p = 1/2 x 90  c.) 2p = 90   D.)  p/2 = 90\r<BR>\n" );
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document.write( "Could you please help and explain! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #385291 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=385291\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let P = price of a new book\r<BR>\n" );
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document.write( "Since \"Mary knows that a used Biology book may costs about half as much as a new one\", this means that we can say\r<BR>\n" );
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document.write( "Price of Used Book = Half of Price of New Book\r<BR>\n" );
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document.write( "But we know that the price of a used book is $90, so we can replace the left side to get\r<BR>\n" );
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document.write( "90 = half of price of new book\r<BR>\n" );
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document.write( "Now we can replace the right side with P/2 since this represents cutting the price of a new book in half (cutting something in half or dividing by 2 is the same thing)\r<BR>\n" );
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document.write( "So we now have\r<BR>\n" );
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document.write( "90 = P/2\r<BR>\n" );
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document.write( "Finally, we can flip the equation to get\r<BR>\n" );
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document.write( "P/2 = 90\r<BR>\n" );
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document.write( "So the answer is choice D\r<BR>\n" );
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document.write( "Jim<BR>\n" );
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