If the average arithmetic mean of 8, 12, 15, 21, x and 11 is 17 then what is x ?

(A) 3
(B) 15
(C) 17
(D) 35
Solution:
8, 12, 15, 21, X, 11 is 17
A.M = (8+12+15+21+x+11)/6 =17
X + 67 = 17 X 6
X + 67 = 102
X = 102 – 67
X = 35

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