Write the equilibrium-constant expression for the reaction:
A(s) + 3B(aq) = 2C(aq) + D(aq)
in terms of [A], [B], [C], and [D]. Note that Kc, which is sometimes symbolized as "Ke", denotes the equilibrium constant expressed using molar concentrations. For this question, Ke means the same thing as Keq.