A cricketer whose bowling average is 12.4 runs per wicket,takes 5 wickets for 26 runs and thereby decreases his average by 0.4.The number of wickets taken by him till last match ,...a)64 b)72 c)80 d)85

• d) 85
  
  Upto last match, let the wickets was x, and runs=12.4x
  New average after taking 5 wickets for 26 runs =(12.4x + 26)/(x+5) =(12.4 - 0.4)
  => 12.4x + 26 =12x + 60
  => 0.4x = 34 or x=85
• 7 years agoHelpfull: Yes(0) No(0)
• 12.4 x +26 = 12(x+5) (x be the number of wickets taken initially)
  12.4x + 26 = 12x + 60. 0.4x = 60-26 = 34. x = 85
• 7 years agoHelpfull: Yes(0) No(0)