When George was 12, his father was thrice his age, or his father was 36

Their age difference, which will never change is: 36 - 12, or 24

With George's age being G, and his father's, F, we get: F - G = 24 ------ eq (i)

Currently, father is twice George's age, so we can say that: F = 2G ----- eq (ii)

2G - G = 24 -------- Substituting 2G for F in eq (i)

G, or George is:  years-old

Father is: 2(24), or  years-old 

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