A batsman in his 12th innings makes a score of 63 runs and there by increases his average score by 2. What is his average after the 12th innings ?

Answer: Option C

Let the average score till his 11 innings = x
According to the question,
⇒ $$\frac{11x+63}{12}$$   = x + 2
⇒ 11x + 63 = 12x + 24
⇒ x = 39
12^th innings average = 39 + 2 = 41