pressive strength ?A. 5300 B. 5000 C. 5700 D. 5800

1-If water-cement ratio of 0.4 is required to make concrete , how much water is need for 250 lb of cement ?A. 100 lb B. 625 lb C. 179 lb D. 722-To achieve the maximum density gradiation for aggregates , what is the passing perecentage of 19 mm aggregates ? ( Assuming the max aggregate size is 25 mm and using the 0.45 power low )A. 3.5”x3.5” B. 4”x4” C. 4.5”x4.5” D. 4.5”x4”3- the structural engineer specefies concrete compressive strength of 5000 psi for a column and the required minimum reliability for mix design is 90%. Based on the historical data , the concrete strength has a standard deviation of 300 psi ( number of sample > 100 ) . what is the required compressive strength ?A. 5300 B. 5000 C. 5700 D. 5800