1. The problem statement, all variables and given/known data 2. Relevant equations .Q = CVab 3. The attempt at a solution I am having a hard time understanding when to put the capacitance in the denominator. I get that Voltage = Charge/Capacitance, but for the equation circled in red "q1/c + q2/c = q3c" ... I don't get why each of those charges have their corresponding value of capacitance under it. If you look at two equations up "q2+q3 = q4" does need the capacitance in it.