document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1174605>Question 1174605</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a man  is 6 times old as his son. twenty years later he will be twice as old as his son find the man age when his son was born?\r<BR>\n" );
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document.write( "A man is six times as old as his son.  Twenty years later, he will be twice as old as his son.  Find the man's age when his son was born.<BR>\n" );
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document.write( "m, the man<BR>\n" );
document.write( "s, the son\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=system%28m=6s%2Cm%2B20=2%28s%2B20%29%29 ALIGN=MIDDLE  ALT=\"system%28m=6s%2Cm%2B20=2%28s%2B20%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "-\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=6s%2B20=2%28s%2B20%29 ALIGN=MIDDLE  ALT=\"6s%2B20=2%28s%2B20%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=6s%2B20%2B2s%2B40 ALIGN=MIDDLE  ALT=\"6s%2B20%2B2s%2B40\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4s=20 ALIGN=MIDDLE  ALT=\"4s=20\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight_green%28s=5%29 ALIGN=MIDDLE  ALT=\"highlight_green%28s=5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >-----------------the son now\r<BR>\n" );
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document.write( "That means, the son was age  0, at five years in the past.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m=30 ALIGN=MIDDLE  ALT=\"m=30\"   DISABLED_style= \"max-width:90%; height:auto;\" >-------------------father now.\r<BR>\n" );
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document.write( "When son was born, was five years ago, so than, father was <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28highlight%2825%29%29 ALIGN=MIDDLE  ALT=\"highlight%28highlight%2825%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >. </SPAN>\n" );
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