Two small, identical, charged spheres attract each other with a force of 8.0 x 10-5 N, when they are 30 cm apart. They are touched together, and are again placed 30 cm apart, but they now exert a force of repulsion of 1.0 x 10-5 N on each other. What is the charge on each sphere after they are touched, and what was the charge on each before they were touched?

see attached image