Seven years ago, Grogg's dad was 9 times as old as Grogg, and 6 years ago, his dad was 3 times as old as Grogg. How old is Grogg's dad currently?
D==Dad, G==Grogg
[D - 7] == 9 * [G - 7]......................(1)
[D - 6] == 3 * [G - 6].....................(2), solve for D, G
D ==10 years ??!
G ==22 / 3 ??!
P.S. Your question doesn't make sense as written. Check your numbers carefully.