A man whose bowling average is 22.2, takes 4 wickets for 36 runs and thereby decreases his average by 1.2. The number of wickets, taken by him before his last match is :

14

22

38

40

Let the number of wickets taken before the last match is x. Then, (22.2x + 36)/(x + 4) = 21 => 22.2x+36 = 21x+84 => 1.2x = 48 => x = 48 / 1.2 = 40

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