Finding battery voltage in a circuit with a 3 amp bulb and 1.5 ohm resistance

[Skittles]

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?

 

[chroot]

Use Ohm's law.

- Warren