Two identical metallic spheres, having unequal, opposite charges are placed at a distance 0.90m apar

Two identical metallic spheres, having unequal, opposite charges are placed at a distance 0.90m apart in air. After bringing them in contact with each other, they are again placed at the same distance apart. Now the force of repulsion between them is 0.025N. Calculate the final charge on each of them.

[@qeev23]

Sir but they have unequal charge How can we take q^2???