document.write( "Question 595165: Four years ago, a father was 2 times as old as his son, now their combined ages equal 107 years. thus the father's present age is what? \n" ); document.write( "

Algebra.Com's Answer #377083 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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Four years ago, a father was 2 times as old as his son, now their combined ages equal 107 years.
\n" ); document.write( " thus the father's present age is what?
\n" ); document.write( ":
\n" ); document.write( "f = father's age
\n" ); document.write( "s = son's age
\n" ); document.write( ":
\n" ); document.write( "\"Four years ago, a father was 2 times as old as his son,\"
\n" ); document.write( "f - 4 = 2(s-4)
\n" ); document.write( "f - 4 = 2s - 8
\n" ); document.write( "f = 2s - 8 + 4
\n" ); document.write( "f = 2s - 4
\n" ); document.write( ":
\n" ); document.write( "\" now their combined ages equal 107 years.\"
\n" ); document.write( "f + s = 107
\n" ); document.write( "f = (107-s)
\n" ); document.write( "replace f in the 1st equatin
\n" ); document.write( "107 - s = 2s - 4
\n" ); document.write( "107 + 4 = 2s + s
\n" ); document.write( "111 = 3s
\n" ); document.write( "s = 111/3
\n" ); document.write( "s = 37 yrs is son's age
\n" ); document.write( "then
\n" ); document.write( "107 - 37 = 70 is father's age
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "Check this in the statement:
\n" ); document.write( "\"Four years ago, a father was 2 times as old as his son, \"
\n" ); document.write( "70 - 4 = 2(37 - 4)
\n" ); document.write( "66 = 2(33) \n" ); document.write( "

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