show complete solution and provide an explanation. Use hydrostatic equilibrium concept in solving.

let A m^2 be the cross-sectional area of each of the large reservoirs and a m^2 be the cross-sectional area of each of the tubes forming the U.

Show how the equation below was derived. Provide a complete solution with an explanation. P0pb=(RR0)(Aa+AagAaC)g where R0 is the reading when p0=pv,R is the actual reading. pA is the density of the heavier fluid, and g is the density of the lighter fluid. Usually, a/A is made sulficiently