document.write( "Question 766388: The sum of the ages of a father and his son is 40 years.If they both live until the son becomes as old as the father is now, the sum of their ages will be 96 years . Find their present ages. \n" ); document.write( "
Algebra.Com's Answer #466952 by ankor@dixie-net.com(22740)\"\" \"About 
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The sum of the ages of a father and his son is 40 years.If they both live until
\n" ); document.write( " the son becomes as old as the father is now, the sum of their ages will be 96 years .
\n" ); document.write( " Find their present ages.
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\n" ); document.write( "Let f = father's age
\n" ); document.write( "Let s = son's age
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\n" ); document.write( "Write an equation for each statement.
\n" ); document.write( "\"The sum of the ages of a father and his son is 40 years.'
\n" ); document.write( "f + s = 40
\n" ); document.write( "s = (40-f)
\n" ); document.write( ":
\n" ); document.write( "If they both live until the son becomes as old as the father is now, the sum of their ages will be 96 years. \"
\n" ); document.write( "f + f + (f-s) = 96
\n" ); document.write( "2f + (f-s) = 96
\n" ); document.write( "3f - s = 96
\n" ); document.write( "3f -(40-f) = 96
\n" ); document.write( "3f - 40 + f = 96
\n" ); document.write( "4f = 96 + 40
\n" ); document.write( "4f = 136
\n" ); document.write( "f = 136/4
\n" ); document.write( "f = 34 is father's age
\n" ); document.write( "then
\n" ); document.write( "40 - 34 = 6 yrs is son's age
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\n" ); document.write( "Check this: the dif in their ages 34-6 = 28;
\n" ); document.write( " 34 + 28 + 6 + 28 = 96\r
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