document.write( "Question 928023: How to set up this equation? Cathy is 16 years younger than Mary. In 5 years, Mary will be as twice as old as Cathy. Find their ages now. \n" ); document.write( "

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\n" ); document.write( "How to set up this equation? Cathy is 16 years younger than Mary. In 5 years, Mary will be as twice as old as Cathy. Find their ages now.
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Let Cathy's present age, be C
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document.write( "Then Mary's present age = C + 16
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document.write( "We then have: C + 16 + 5 = 2(C + 5)
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document.write( "C + 21 = 2C + 10
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document.write( "C - 2C = 10 - 21
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document.write( "- C = - 11
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document.write( "C, or Cathy's present age = , or 
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document.write( "Mary's present age: 11 + 16, or 
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document.write( "You can do the check!!  \n" );
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