The average age of A and B is 20 years. If C replace A the average would be 19 a

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

22, 20, 18
22, 18, 20
18, 20, 22
18, 22, 20

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