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How many volts ?



What is a correct reasoning? What is the correct answer?
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AN ELECTROSTATIC PROBLEM

Two identical metallic plates (A1=A2 = area = 1 meter^2) are far away
from each other. Supported by isolated handles they are charged. The
first plate receives Q1=-10nC while the second receives Q2=+100nC.
Then the plates are moved toward each other and a capacitor is created.
The distance between parallel plates is 0.01 meter. Thus we know that
C=0.885 nF (vacuum). Predict the difference of potential, dV.
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If the absolute values of Q1 and Q2 were equal then we would have
dV=Q1/C. But charges are different in this problem. How to calculate dV?
Ludwik Kowalski