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Puzzle ZKLD 



?

Three teachers were discussing how long they had been teaching.

Alex and Billie had been teaching for a total of 36 years.
Charlie and Billie had been teaching for a total of 22 years.
Charlie and Alex had been teaching for a total of 28 years.
How long had each been teaching?

Puzzle Copyright © Kevin Stone

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Hint
If we look at all of the clues, each person appears exactly twice.

 

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