Three identical metal spheres are charged so that sphere A has a charge of 290 oC, sphere B has a charge of -200 oC, and sphere C has a charge of 150 ?C. Sphere A is brought into contact with sphere B and the two are allowed to reach equilibrium. Sphere A is then removed. Next sphere A is brought into contact with sphere C and the two are allowed to reach equilibrium. Sphere A is then removed. What is the final charge on each sphere?