document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=29848>Question 29848</A>: <I><SPAN STYLE=\"word-break: break-all;\"> My son brought home a math problem from his 5th grade math class.  There is no explanation on the page and he claims he's never seen it before.  The problem is as follows--->        3:15::60:_____\r<BR>\n" );
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document.write( "I have searched to understand what the colons and double-colon signify but cannot locate the use.  Is this to infer a sequence that he is supposed to finish?  If so, what is the significance between the single and double colon.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #16581 by </B><A HREF=/tutors/aboutme.mpl?userid=longjonsilver><B>longjonsilver(2297)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=longjonsilver><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=longjonsilver><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=16581\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the : symbol is used in ratios.\r<BR>\n" );
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document.write( "if i have $30 and you have $50, we can say the ratio is 30:50 or 3:5.\r<BR>\n" );
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document.write( "The double colon i have not seen but i am guessing it is saying:\r<BR>\n" );
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document.write( "you have the ratio 3:15 and also the ratio 60:x and these ratios are the same.\r<BR>\n" );
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document.write( "Method:<BR>\n" );
document.write( "3:15 scaled up by factor of 20 is 60:300\r<BR>\n" );
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document.write( "so the unknown is, i believe, 300\r<BR>\n" );
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document.write( "Jon.\r<BR>\n" );
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