Two simultaneous reactions are taking place 2A+3B>4D, and B+D>2U where D is the desired product and U the undesired product. The extent of the first reaction is 10mol/s and that of the second reaction is 5 mol/s. The feed contains 40mols/s of A and 65mol/s of B. The product stream contains 20 moles of A,25 moles of B,35 moles of D and 10 moles of U. Then yield is