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The average age of A and B is 20 years. ...

The average age of A and B is 20 years. If A is replaced by C, the average age would be 19 and if B is replaced by C, the average age would be 21. What are the ages of A, B and C?

A

18, 20, 22

B

18, 22, 20

C

22, 20, 18

D

22, 18, 20

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