Moment about point A

Location of R as measured from point A

Magnitude of horizontal couple at B and C

Thus the given system is equivalent to downward force of 50 kN at point A and clockwise couple of 220 kN·m. The couple is represented by 110 kN horizontal forces at B and C. The force at B is to the right and the force at C is to the left, producing the clockwise couple.           answer