A plate is subjected to four pairs of forces of 50-lb, 60-lb, 150-lb, and 350-lb-in as shown. If the resultant moment of the couples of forces is 400 lb-in clockwise, determine the angle of the couple...

A plate is subjected to four pairs of forces of 50-lb, 60-lb, 150-lb, and 350-lb-in as shown. If the resultant moment of the couples of forces is 400 lb-in clockwise, determine the angle of the couple of forces, 50 lb