23. Concrete has density roughly 150 lb/ft3 . a) Convert this to kg/m3 using 2.205 lb = 1.000 kg and 3.281 ft = 1.000 m. Note: ft, m, are not yet cubic. . .you must cube numbers to create volumes. b) A large concrete structure measures 3.05 m by 6.50 m by 1.90 m. Calculate its mass in kg. 0) Convert the mass from part (b) to pounds