Intensity through each power source

[alexmath]

Homework Statement

Please help me to solve this type of circuits...
I want to find the intensity through each power source and what voltage does the voltmeter indicates.

http://iceimg.com/i/f5/1d/2da68fc0a6.png

Homework Equations

I=I1+I2

The Attempt at a Solution

don't know

 

[jedishrfu]

have you tried kirchhoffs rules?

 

[CWatters]

To work out the current flowing around the black loop you could start by simplifying the circuit. How do you simplify two resistors in series? Two voltage sources in series?

 

[alexmath]

36v-i(9)-12v=0
i=2.66A