1. The problem statement, all variables and given/known data Find the pd accros C2 2. Relevant equations Q=CV 3. The attempt at a solution i find C23 = (C2C3)/ (C2 + C3) then find Q23 = V x C23 Q23 = Q2 = C2V2 => V2 i used this and got V2 = 15V , however the answer is 20V , and i even didnt use the data of C1 . am i wrong somewhere ?