Center of mass XCM

Three balls are attached to a light rigid rod, as shown in the figure. A fulcrum is located at xf = 18.5 cm measured from the left end of the rod. Ball A has mass mA = 40 g and is located at xA = 7 cm. Ball B has mass mB = 9 g located at xB = 24 cm. Ball C has mass mC = 20 g located at xC = 32 cm. Calculate the x-coordinate of the center of mass XCM. Assume that the mass of the rod is small enough to be ignored in your calculation. Your answers should be accurate to within 0.1 cm

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