A man whose bowling average is 12.4, takes 6 wickets for 26 runs and there by decreases his average by 0.4. the number of wickets taken by him before his last match is?
Answers:  A) 113  B) 114  C) 115  D) 116  E) 117

Rationale: "12.4 * x + 26 = ( 6 + x ) 12 solve equation x = 115 answer : c"
Answer: C