document.write( "Question 1141103: A man is three times as old as his son. Four years ago he was four times as old as his son was at that time. How old is the son \n" ); document.write( "

Algebra.Com's Answer #761644 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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\n" ); document.write( "m = man's age
\n" ); document.write( "s = son's age
\n" ); document.write( ":
\n" ); document.write( "A man is three times as old as his son.
\n" ); document.write( "m = 3s
\n" ); document.write( " Four years ago he was four times as old as his son was at that time.
\n" ); document.write( "m - 4 = 4(s - 4)
\n" ); document.write( "m - 4 = 4s - 16
\n" ); document.write( "m = 4s - 16 + 4
\n" ); document.write( "m = 4s - 12
\n" ); document.write( ":
\n" ); document.write( " How old is the son
\n" ); document.write( "replace m with 3s
\n" ); document.write( "3s = 4s - 12
\n" ); document.write( "12 = 4s - 3s
\n" ); document.write( " s = 12 yrs old is the son
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "Check solution in the statement:
\n" ); document.write( "m = 3(12) = 36
\n" ); document.write( "\"Four years ago he was four times as old as his son was at that time. \"
\n" ); document.write( "36 - 4 = 4(12 - 4)
\n" ); document.write( "32 = 4(8) \n" ); document.write( "

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