A body is subjected to the following three couples: (a) 30-lb forces, 3-in. arm, counterclockwise; (b) 20-lb forces, 6-in. arm, counterclockwise; (c) 10-lb forces, 5-in. arm, clockwise. Determine the required magnitude of the forces of a single resultant couple, equivalent to the three given couples, and having a 2.5-in. arm.
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