document.write( "Question 1209080: Seven years ago, Grogg's dad was 9 times as old as Grogg. Three years ago, Grogg's dad was 2 times as old as Grogg. How old is Grogg's dad currently? \n" ); document.write( "

Algebra.Com's Answer #847878 by MathTherapy(10552) $\"\"$ $\"About$

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document.write( "Seven years ago, Grogg's dad was 9 times as old as Grogg.  Three years ago, Grogg's dad was 2 times as old as Grogg.\r\n" );
document.write( "How old is Grogg's dad currently?\r\n" );
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document.write( "That other person made things so COMPLEX. All he had to do was keep the ages CURRENT/\"in-the-now\", as was requested. What sense\r\n" );
document.write( "does it make to solve for past ages when current ages are required? Inquiry minds want to know!! \r\n" );
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document.write( "Let Grogg's and his Dad's ages, be G and D, respectively\r\n" );
document.write( "As such, 7 years ago, the Dad and Grogg were D - 7 and G - 7, respectively\r\n" );
document.write( "Likewise, 3 years ago, the Dad and Grogg were D - 3 and G - 3, respectively\r\n" );
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document.write( "Then we get: D - 7 = 9(G - 7)____D - 7 = 9G - 63___D - 9G = - 56 ---- eq (i)\r\n" );
document.write( "Also, D - 3 = 2(G - 3)___D - 3 = 2G - 6___D - 2G = - 3 ---- eq (ii)\r\n" );
document.write( "Subtracting eq (i) from eq (ii), we get: 7G = 53\r\n" );
document.write( "Grogg's current age, or G =  or , which is a NON-INTEGER, and a seemingly NON-SENSICAL answer. \r\n" );
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document.write( "You could have also kept this to one variable: either G for Grogg's age, or D for his Dad's.

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