W, X, Y and Z organized a general partnership with W and X as industrial partners and Y and Z as capitalist partners. Y contributed P.5M and Z contributed P.2M to the common fund. By a unanimous vote of the partners, W and X were appointed managing partners, without specification of their duties and powers. A applied as secretary and B applied as accountant of the partnership. The hiring of A was decided upon by W and X but was opposed by Y and Z. Whose decision shall prevail?