Charge conservation on capacitor

[SANGEETAMILIND]

1. 
   1. Homework Statement

final charge on 3 microF be q1, on 2 microF be q2 and on 1.5 microF be q3

Intial charge on 3 microF is 360 microC and intial charge on 2 microC is 300 microF

Homework Equations

how the charge conservation takes place at the three junctions in the circuit

The Attempt at a Solution

 

[cnh1995]

You need to show your working. Which equations do you thing would be helpful?