The average of 11 results is 50. If the average of first six results is 49 and that of the last six is 52, then find the sixth result.

56

                Average       ×         Numbers           =            Total

                     50            ×             11                =             550

First Six  →   49            ×              6                 =             294

Last Six  →   52            ×              6                 =             312  

So there is one extra number and that is sixth = (312 + 294) - 550 = 56