+577 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?
+1071
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?
(D – 7) = (9)(G – 7) ..............—> D – 7 = 9G – 63 (eq 1)
(D – 4) = (6)(G – 4) ..............—> D – 4 = 6G – 24 (eq 2)
subtract (2) from (1) – 3 = 3G – 39
36 = 3G
Grogg = 12
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