document.write( "Question 1177939: A man is 12 times as old as his son. In 9 years time, he will be only 3 times as old as his son. How old are each? \n" ); document.write( "

Algebra.Com's Answer #807099 by ikleyn(52803) $\"\"$ $\"About$

You can put this solution on YOUR website!
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\n" ); document.write( "A man is 12 times as old as his son. In 9 years time, he will be only 3 times as old as his son.
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document.write( "Let x be the son's age;\r\n" );
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document.write( "then the father's age is 12x.\r\n" );
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document.write( "In 9 years\r\n" );
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document.write( "    3*(x+9) = 12x + 9.\r\n" );
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document.write( "Simplify and solve\r\n" );
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document.write( "    3x + 27 = 12x + 9.\r\n" );
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document.write( "    27 - 9  = 12x - 3x\r\n" );
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document.write( "       18   = 9x\r\n" );
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document.write( "        x   = 18/9 = 2 years old.\r\n" );
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document.write( "ANSWER.  The son is 2 years old;  the father is  12*2 = 24  years old.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Solved.\r
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\n" ); document.write( "\n" ); document.write( "There is a bunch of lessons on age word problems \r
\n" ); document.write( "\n" ); document.write( "    - Age problems and their solutions\r
\n" ); document.write( "\n" ); document.write( "    - HOW TO algebreze and to solve age problems? \r
\n" ); document.write( "\n" ); document.write( "    - A fresh formulation of a traditional age problem\r
\n" ); document.write( "\n" ); document.write( "    - Really intricate age word problems\r
\n" ); document.write( "\n" ); document.write( "    - Selected age word problems from the archive\r
\n" ); document.write( "\n" ); document.write( "    - Age problems for mental solution \r
\n" ); document.write( "\n" ); document.write( "    - Age problem for three participants \r
\n" ); document.write( "\n" ); document.write( "    - Miscellaneous age problems \r
\n" ); document.write( "\n" ); document.write( "in this site.\r
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\n" ); document.write( "\n" ); document.write( "Read them and become an expert in solving age problems.\r
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\n" ); document.write( "\n" ); document.write( "Also, you have this free of charge online textbook in ALGEBRA-I in this site\r
\n" ); document.write( "\n" ); document.write( "    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.\r
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\n" ); document.write( "\n" ); document.write( "The referred lessons are the part of this online textbook under the topic \"Age word problems\".\r
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\n" ); document.write( "\n" ); document.write( "Save the link to this online textbook together with its description\r
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\n" ); document.write( "\n" ); document.write( "Free of charge online textbook in ALGEBRA-I
\n" ); document.write( "https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson\r
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\n" ); document.write( "\n" ); document.write( "to your archive and use it when it is needed.\r
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\n" ); document.write( "\n" ); document.write( "Ignore the post by @Mananth --- it is IRRELEVANT.\r
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\n" ); document.write( "\n" ); document.write( "70% of his (or her) writing is EITHER wrong OR irrelevant.\r
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