A man whose bowling average is 12.4 takes 5 wickets for 26 runs and thereby decreases his average by 0.4. What is the number of wickets taken by him before his last match?
Let the number of wickets taken by him before the match be x.
The bowling average is given to be 12.4.
Total runs =12.4x
The runs scored including this match is given by 12.4x+26 with the average of 12.
Hence, 85 wickets are taken by the man before his last match.