A batsman makes a score of 65 runs in the 17th inning and thus increases his average by 3. Find his average after 17th inning.  Choices:
A) 17
B) 39
C) 42
D) 45
E) none of the above

Rationale: let the average after 17 th inning = x . then , average after 16 th inning = ( x – 3 ) . ∴ 16 ( x – 3 ) + 65 = 17 x or x = ( 65 – 48 ) = 17 . answer a
Answer: A