document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1207400>Question 1207400</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Kenneth's father is 36 years older than he is. In 7 years' time, his father will be double Kenneth's age. How old is Kenneth's father now? </SPAN>\n" );
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document.write( "A formal algebraic solution....<br><BR>\n" );
document.write( "Let x be the age of Kenneth's father<BR>\n" );
document.write( "Then x-36 is Kenneth's age<br><BR>\n" );
document.write( "x+7 = father's age in 7 years<BR>\n" );
document.write( "(x-36)+7 = x-29 = Kenneth's age in 7 years<br><BR>\n" );
document.write( "In 7 years, the father's age will be twice Kenneth's age:<br><BR>\n" );
document.write( "x+7=2(x-29)<BR>\n" );
document.write( "x+7=2x-58<BR>\n" );
document.write( "65=x<br><BR>\n" );
document.write( "ANSWER: 65<br><BR>\n" );
document.write( "CHECK: x+7=65+7=72; x-29=65-29=36; 72=2*36<br><BR>\n" );
document.write( "Informally (using logical reasoning and simple mental arithmetic, which is good exercise)....<br><BR>\n" );
document.write( "The difference in their ages is 36; when the father is twice as old, their ages will be 72 and 36.  That will be 7 years from now, so the father's age now is 72-7 = 65<br>\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );