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If A = 1/5 and B = 1/8 and the average of A, B and C is 9/40. What is the value of C

If A = 1/5 and B = 1/8 and the average of A, B and C is 9/40. What is the value of C given that A, B and C are three rational numbers? 1. 13/40 2. 7/20 3. 1/12 4. 1/20 None of these 5.

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