document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1193345>Question 1193345</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A boy  is  one-fifth of his father age. In three years time, the sum of their ages will be 72. How old are they now?  </SPAN>\n" );
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document.write( "Informally....<br><BR>\n" );
document.write( "Since the sum of their ages 3 years from now will be 72, the sum of their ages now is 66.<br><BR>\n" );
document.write( "We need to divide those 66 years into two parts in the ratio 5:1; their ages are 55 and 11.<br><BR>\n" );
document.write( "Formally....<br><BR>\n" );
document.write( "x = son's age now<BR>\n" );
document.write( "5x = father's age now<BR>\n" );
document.write( "x+3 = son's age 3 years from now<BR>\n" );
document.write( "5x+3 = father's age 3 years from now<br><BR>\n" );
document.write( "The sum of their ages 3 years from now will be 72:<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x%2B3%29%2B%285x%2B3%29=72 ALIGN=MIDDLE  ALT=\"%28x%2B3%29%2B%285x%2B3%29=72\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=6x%2B6=72 ALIGN=MIDDLE  ALT=\"6x%2B6=72\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=6x=66 ALIGN=MIDDLE  ALT=\"6x=66\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=11 ALIGN=MIDDLE  ALT=\"x=11\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "ANSWER: The son's age now is x=11; the father's age now is 5x=55.<br><BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );