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Puzzle - Hint

Three teachers were discussing how long they had been teaching.

Adrian and Betty had been teaching for a total of 36 years.

Charlie and Betty had been teaching for a total of 22 years.

Charlie and Adrian had been teaching for a total of 28 years.

How long had each been teaching?

 [Ref: ZKLD] © Kevin Stone

Hint: Adrian had been teaching 6 years longer than Betty.

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