A batsman makes a score of 86 runs in the 17th inning and thus increases his averages by 3.Find his average after 17th inning? Choose the correct choice from the following answers.
A) 19 B) 29 C) 38 D) 49 E) 59

Rationale: "let the average after 17 th inning = x then average after 16 th inning = ( x - 3 ) therefore 16 ( x - 3 ) + 86 = 17 x therefore x = 38 answer : c"
Answer: C