Question 1115095
"Of 4 years age, Edwin's grandfather was four times as old as Edwin"
So, when Edwin was 4 his grandfather was 4 x 4 = 16? That is not possible in humans, very few men are fathers at 16, let alone grandfathers.
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You've been posting this problem and not getting answers because it is wrong. Please correct it. 
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My guess is that it should be either "4 years ago Edwin's grandfather was 4 times his age" or "in 4 years (or 4 years hence) Edwin's... "