Alcohol Amount in Cocktails

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I have the choice between 2 drinks:

1 12oz can of a pre-made cocktail which is 5% alcohol by volume

1 drink that is 3oz of vodka (45% alcohol by volume) and 12oz of seltzer (0% alcohol by volume)

Which contains more alcohol by volume? Which contains more alcohol in total? Also, if you could show your work that would be great as a resource for the future when trying to see how much is in a drink. I have a low tolerance, so I like to know how much I’m drinking when in social situations.

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