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posted by Oscar Tuesday, February 5, 2013 at 7:53pm.

the average (arithmetic mean) of a and b is 6 and the average of a, b, c is 11. What is the value of c?

(a+b)/2 = 6 a+b = 12 (a+b+c)/3 = 11 a+b+c = 33 12+c = 33 c = 21

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