Question 1209080
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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?

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
does it make to solve for past ages when current ages are required? Inquiry minds want to know!! 

Let Grogg's and his Dad's ages, be G and D, respectively
As such, 7 years ago, the Dad and Grogg were D - 7 and G - 7, respectively
Likewise, 3 years ago, the Dad and Grogg were D - 3 and G - 3, respectively

Then we get: D - 7 = 9(G - 7)____D - 7 = 9G - 63___D - 9G = - 56 ---- eq (i)
Also, D - 3 = 2(G - 3)___D - 3 = 2G - 6___D - 2G = - 3 ---- eq (ii)
Subtracting eq (i) from eq (ii), we get: 7G = 53
Grogg's current age, or G = {{{53/7}}} or {{{7&4/7}}}, which is a NON-INTEGER, and a seemingly NON-SENSICAL answer. 

You could have also kept this to one variable: either G for Grogg's age, or D for his Dad's.</pre>