document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1150570>Question 1150570</A>: <I><SPAN STYLE=\"word-break: break-all;\"> today the father is 51 years  and his son is 9 years . In how many years the father will be four times as old as his son? </SPAN>\n" );
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document.write( "The difference in their ages is 51-9 = 42 years.<br><BR>\n" );
document.write( "When the father is 4 times as old as his son, their ages will be 4x and x; the difference will be 3x.<br><BR>\n" );
document.write( "3x = 42<BR>\n" );
document.write( "x = 42/3 = 14<br><BR>\n" );
document.write( "The father will be 4 times as old as his son when the son is x=14 and the father is 4x=56.<br><BR>\n" );
document.write( "Since the father is now 51, that will be 5 years from now.<br><BR>\n" );
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