+479 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?
+16 d−4=5(g−4)................(1)
d==5(g - 4) + 4
d−7=8(g−7)................(2)
5(g - 4) + 4 - 7==8(g - 7)
5g - 20 + 4 - 7==8g - 56
56 - 20 + 4 - 7==8g - 5g
33 == 3g
g==33/3==11 - sub this into (2) above
d - 7==8(11 - 7)
d - 7 ==32
d ==32 + 7 ==39 years - his dad's current age.
