3. Find the difference in pressure between tanks A and B in the figure below, where d₁- 330mm, dz 160mm, d, 480mm and d4-230mm 781 Mercury 4. If liquid A weighs 53.5 lbs/ft^3 and liquid B weighs 78.8lbs/ft^3. Liquid M is mercury. If the pressure at B is 30PSI, find the pressure at A. 1.3 ft. b 6.5 ft 10.0 ft Σ