Figure shows four identical conducting spheres that are actually well separated from one another. Sphere W (with

Question:

Figure shows four identical conducting spheres that are actually well separated from one another. Sphere W (with an initial charge of zero) is touched to sphere A and then they are separated. Next, sphere W is touched to sphere B (with an initial charge of ?? 32e) and then they are separated. Finally, sphere W is touched to sphere C (with an initial charge of + 48e), and then they are separated. The final charge on sphere W is + l8e.What was the initial charge on sphereA?