‘When Gwen is twice as old as Dean, Then I shall be just 17. But Gwendoline was 23

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Math Riddle:   ‘When Gwen is twice as old as Dean, Then I shall be just 17. But Gwendoline was 23 When Dean was twice as old as me.’ That’s what Bill said.

So tell us then, How old he was when Dean was ten?

Answer: The correct answer is eight.

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