Voltage of Battery in Circuit with Bulb, Battery & Wires

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I'm not sure how to figure this one out:

In a circuit with just a bulb, battery, and two wires, 3 amperes of current passes through the light bulb. The resistance of the light bulb is 1.5 ohms. What is the voltage of the battery?
 
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Use Ohm's law.

- Warren
 
I don't get how to argue it. i can prove: evolution is the ability to adapt, whether it's progression or regression from some point of view, so if evolution is not constant then animal generations couldn`t stay alive for a big amount of time because when climate is changing this generations die. but they dont. so evolution is constant. but its not an argument, right? how to fing arguments when i only prove it.. analytically, i guess it called that (this is indirectly related to biology, im...
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