Whats the best w/c ratio?

The cement, coarse aggregate, and fine aggregates that you will use in the concrete laboratories are described below: Cement: Type I-II SG = 3.15 Coarse Aggregate: 3/4" top size Dry Rodded Unit Weight = 92.0 lb/ft? BSG = 2.54 moisture content = 1.6% absorption = 2.1% Fine Aggregate: BSG - 2.58 Fineness Modulus 2.40 moisture content -0.36% absorption - 1.1% This assignment is to proportion a concrete mixture with a water-cement ratio of 0.45, 0.50, 0.55, or 0.60 using a target slump of 3 to 4 inches. Determine the batch quantities for 1 ft. Adjust the batch quantities for moisture