If x and y are the molar fractions of a certain component (A) in the liquid and gas phases, respectively, and xa and xb represent the molar fractions of component A in the liquid phase at the inlet and outlet, respectively, and xa* and xb* represent the molar fractions of component A in the gas phase at the inlet and outlet, respectively, when reaching equilibrium with the liquid phase, answer the following questions:

(a) In an equilibrium stage operation, a dilute ammonia solution is to be stripped using a continuous countercurrent gas stripping apparatus with air to remove ammonia (NH3) from the aqueous solution. The flow rate of air in the system is V, the flow rate of the ammonia solution is L, and the equilibrium relationship between NH3 in the gas and liquid phases can be expressed as y = 0.8x. If a removal rate of 95% is desired in this operation, what is the minimum ratio of air flow rate to water solution flow rate (V/L)min? What is the ideal number of plates required at this time?