document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=218792>Question 218792</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If Rita is eight years old, is twice as old as her sister.  How old will Rita be when she is one and a four times as old as her sister?\r<BR>\n" );
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document.write( "I tried solving this problem but I don't get the concept. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #164708 by </B><A HREF=/tutors/aboutme.mpl?userid=MathTherapy><B>MathTherapy(10552)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=MathTherapy><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/cgi-bin/show-face.mpl?user=MathTherapy><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=164708\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If Rita is eight years old, is twice as old as her sister.  How old will Rita be when she is one and a four times as old as her sister?\r<BR>\n" );
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document.write( "Let the amount of years that it takes for Rita to be 1 1/4, or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5%2F4 ALIGN=MIDDLE  ALT=\"5%2F4\"   DISABLED_style= \"max-width:90%; height:auto;\" > times her sister's age be y\r<BR>\n" );
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document.write( "Since Rita is 8, and her sister's 4\r<BR>\n" );
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document.write( "We'll therefore have: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=8+%2B+y+=+%285%2F4%29%2A%284+%2B+y%29 ALIGN=MIDDLE  ALT=\"8+%2B+y+=+%285%2F4%29%2A%284+%2B+y%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=8+%2B+y+=+%2820+%2B+5y%29%2F4 ALIGN=MIDDLE  ALT=\"8+%2B+y+=+%2820+%2B+5y%29%2F4\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "32 + 4y = 20 + 5y ----- Cross-multiplying \r<BR>\n" );
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document.write( "4y - 5y = 20 - 32\r<BR>\n" );
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document.write( "- y = - 12\r<BR>\n" );
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document.write( "y = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28-12%29%2F-1 ALIGN=MIDDLE  ALT=\"%28-12%29%2F-1\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 12 \r<BR>\n" );
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document.write( "Therefore, in 12 years' time, Rita will be <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5%2F4 ALIGN=MIDDLE  ALT=\"5%2F4\"   DISABLED_style= \"max-width:90%; height:auto;\" > times her sister's age, which means that she will be <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight_green%2820%29 ALIGN=MIDDLE  ALT=\"highlight_green%2820%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > (8 + 12) years-old.\r<BR>\n" );
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document.write( "This would also mean that in 12 years' time, her sister will be 16 (4 + 12).\r<BR>\n" );
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document.write( "Check<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=8+%2B+12+=+%285%2F4%29%2A%284+%2B+12%29 ALIGN=MIDDLE  ALT=\"8+%2B+12+=+%285%2F4%29%2A%284+%2B+12%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=20+=+%285%2F4%29%2A16 ALIGN=MIDDLE  ALT=\"20+=+%285%2F4%29%2A16\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "20  =  20 (TRUE) </SPAN>\n" );
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