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Seven years ago, Grogg's dad was $9$ times as old as Grogg. Four years ago, Grogg's dad was $6$ times as old as Grogg. How old is Grogg's dad currently?

 Sep 7, 2024
 #1
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Use variables g for grogg and d for dad. We set up the equation d-7 = 9(g-7) and d-4 = 6(g-4).
Solving these equations, we get d = 9g-56 and d=6g-20. Set 9g-56 = 6g-20 and we can get g = 12, plug it back in into the original equation, and groggs dad is 52 years old.

 Sep 7, 2024

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