What is the bowling average of the leading wicket-taker in the 1956–57 Quaid-e-Azam Trophy competition?
1956–57 Quaid-e-Azam Trophy:  Hanif Mohammad was the leading run-scorer and Fazal Mahmood was the leading wicket-taker. Fazal Mahmood:  He played in 34 Test matches and took 139 wickets at a bowling average of 24.70.
24.70