Finding the charge on a capacitor

[nautola]

Homework Statement

http://screencast.com/t/B4865iOOLzX
What is the charge on the 32 μF centered-
upper capacitor?
Answer in units of μC

Homework Equations

Q = CV
1/c = 1/c₁ + 1/c₂...

The Attempt at a Solution

I found the charge across the entire thing and then divided that by 2, since the charge should be the same on all the plates. But that was wrong.

 

[gneill]

What's the potential difference between nodes c and d?

What do you know about the charge distribution on capacitors connected in series?