The average mark obtained by 22 candidates in an examination is 48. The average of the first ten is 55 while the last eleven is 40 .The marks obtained by the 11th candidate is ?\nOptions:\n(A) 22\n(B) 0\n(C) 49\n(D) 58\n(E) 66
Let’s work this out in a step by step way to be sure we have the right answer.
(E)
It is clear that 22 x 48 = 10 x 55 + K + 11 x 40 ⇒⇒ K = 66.

The answer is (E)