The air-oil-water system in Fig. P2.15 is at 20°C. Knowing that gage A reads 15 lbf/in2 absolute and gage B reads 1.25 lbf/in2 less than gage C. Compute (a) the specific weight of the oil in lbf/ft3 and (b) the actual reading of gage C in lbf/in2absolute.