Find the current across the 20 Ω resistor using the image.(adsbygoogle = window.adsbygoogle || []).push({});

http://s1078.photobucket.com/albums/w488/maddy31595/?action=view¤t=Untitled.jpg

So my teacher gave us this problem and the answer, but didn't go over how to get the answer. I have no idea where to even start. Help?

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# Finding the current in a resistor

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