document.write( "Question 1137486: Colin is 9 years older than Richard. David is 12 years younger than Richard. If the total of their ages is 93, how old is the eldest of them? \n" ); document.write( "

Algebra.Com's Answer #755358 by ikleyn(52814) $\"\"$ $\"About$

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document.write( "Obviously, Colin is the eldest.\r\n" );
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document.write( "Let C be the Colin's age.\r\n" );
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document.write( "Then we have an equation\r\n" );
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document.write( "(C-9) + C + ((C-9)-12) = 93\r\n" );
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document.write( "3C - 30 = 93\r\n" );
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document.write( "3C = 93 + 30 = 123\r\n" );
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document.write( "C = 123/3 = 41.\r\n" );
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document.write( "ANSWER.  The eldest, Colin, is 41 years old.\r\n" );
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document.write( "CHECK.  Then Richard is 41-9 = 32 years old;  David is  32 - 12 = 20 years old  and\r\n" );
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document.write( "        41 + 32 + 20 = 93.   ! Correct !\r\n" );
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\n" ); document.write( "\n" ); document.write( "Solved.\r
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