Extracted text: The composite beam consists of a wood core and two plates of steel. If the allowable bending stress for the wood is (ơallow)w = 20 MPa, and for the steel (oallow)st = 130 MPa, determine the maximum moment that can be applied to the beam. E = 11 GPa, E = 200 GPa. 125 mm 20 mm 75 mm 20 mm