document.write( "Question 969546: A man is 41 years old and his son is 9. In how many years will the father be three times as old as his son? \n" ); document.write( "
Algebra.Com's Answer #592405 by Boreal(15235)\"\" \"About 
You can put this solution on YOUR website!
Let x = number of years required.\r
\n" ); document.write( "\n" ); document.write( "Father is 41 +x at that time
\n" ); document.write( "Son is 9 +x at that time\r
\n" ); document.write( "\n" ); document.write( "Father is 3 times the son's age.\r
\n" ); document.write( "\n" ); document.write( "therefore 3(9+x)=41 +x
\n" ); document.write( "Distribute the 3\r
\n" ); document.write( "\n" ); document.write( "27 +3x=41 +x\r
\n" ); document.write( "\n" ); document.write( "Subtract 27 from both sides\r
\n" ); document.write( "\n" ); document.write( "3x=14 +x
\n" ); document.write( "Subtract x from both sides\r
\n" ); document.write( "\n" ); document.write( "2x=14
\n" ); document.write( "Divide both sides by 2\r
\n" ); document.write( "\n" ); document.write( "x=7\r
\n" ); document.write( "\n" ); document.write( "In 7 years, the father will be 48
\n" ); document.write( "In 7 years the son will be 16\r
\n" ); document.write( "\n" ); document.write( "48/16 = 3\r
\n" ); document.write( "\n" ); document.write( "
\n" ); document.write( "
\n" );