document.write( "Question 1096769: Richard is 5 times older than his son. 5 years ago, he is 15 times the age of his son, What is Richard's age today? \n" ); document.write( "

Algebra.Com's Answer #711173 by ikleyn(52802) $\"\"$ $\"About$

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\n" ); document.write( "Richard is 5 times $\"highlight%28cross%28older%29%29\"$ $\"highlight%28cross%28than%29%29\"$ as old as his son is. 5 years ago, he $\"highlight%28cross%28is%29%29\"$ was 15 times the age of his son. What is Richard's age today?
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document.write( "R = 5*S          (1)    (\"now\")\r\n" );
document.write( "R-5 = 15*(S-5)   (2)    (5 years ago)\r\n" );
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document.write( "In (2), replace R by 5*S, based on (1). You will get\r\n" );
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document.write( "5*S - 5 = 15*(s-5)  ====>\r\n" );
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document.write( "5S - 5 = 15S - 75  ====>  75-5 = 15S - 5S  ====>  10S = 70  ====>  S =  = 7.\r\n" );
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document.write( "Answer.  The son is 7 years now.  Richard is 5*7 = 35 years old.\r\n" );
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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( "    - A fresh formulation of a traditional age problem\r
\n" ); document.write( "\n" ); document.write( "    - Really intricate age word problem\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( "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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