document.write( "Question 422330: A father is now three times as old as his son. Twelve years ago he was six times as old as his son. Find the Present age of each \n" ); document.write( "

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\"A father is now three times as old as his son. Twelve years ago he was six times as old as his son. Find the Present age of each\"\r
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\n" ); document.write( "\n" ); document.write( "x = son's age now
\n" ); document.write( "3x = father's age now {father is 3 times as old as his son}\r
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\n" ); document.write( "\n" ); document.write( "x - 12 = son's age twelve years ago
\n" ); document.write( "3x - 12 = father's age twelve years ago\r
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\n" ); document.write( "\n" ); document.write( "3x - 12 = 6(x - 12) {twelve years ago, father was six times as old as his son}
\n" ); document.write( "3x - 12 = 6x - 72 {used distributive property}
\n" ); document.write( "3x = 6x - 60 {added 12 to both sides}
\n" ); document.write( "-3x = -60 {subtracted 6x from both sides}
\n" ); document.write( "x = 20 {divided both sides by -3}
\n" ); document.write( "3x = 60 {substituted 20, in for x, into 3x}\r
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\n" ); document.write( "\n" ); document.write( "son is 20 now
\n" ); document.write( "father is 60 now
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