document.write( "Question 27682:
\n" ); document.write( " Mrs. Jones is three times as old as her son. Ten years ago, she was 5 times as old as her son was then. How old is her son?
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Algebra.Com's Answer #15081 by 88chaos88(6)\"\" \"About 
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Let the age of Mrs. Jones be y. Let the age of her son be x.\r
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\n" ); document.write( "\n" ); document.write( "Mrs. Jones is three times as old as her son:
\n" ); document.write( "\"y=3x\"\r
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\n" ); document.write( "\n" ); document.write( "Ten years ago, she was 5 times as old as her son was then:
\n" ); document.write( "\"y-10=5%28x-10%29\"
\n" ); document.write( "\"y-10=5x-50\" (Expand the brackets)
\n" ); document.write( "\"y=5x-40\" (Add 10 on both sides)\r
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\n" ); document.write( "\n" ); document.write( "Now, you can compare the first equation with the second equation.
\n" ); document.write( "\"3x=5x-40\"
\n" ); document.write( "\"2x=40\" (Group \"3x\" and \"5x\" together)
\n" ); document.write( "\"x=20\" (Age of her son)\r
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\n" ); document.write( "\n" ); document.write( "Her son is 20 years old.
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