A man, whose bowling average is 12.4, takes 5 wickets for 26 runs and thereby

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A man, whose bowling average is 12.4, takes 5 wickets for 26 runs and thereby decreases his average by 0.4. The no. of wickets taken by him before his last match?
___

Options:

Answer: Option A
:

$\frac{(12.4 w + 26)}{(w + 5)} = 12$
On solving, w=85

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