How many calories are there in 200ml of vodka at 37.5%?

64 calories
Vodka, 80 proof (40%)
Quantity 27.8 ml
www.google.com/search?q=how+many+calories+in+vodka%3F

A conversion factor is a fraction equal to 1. You are given that one hour equals 60 minutes so you can write that as hr/60min=1 or 60min/hr=1 whichever works for you and drop it into an equation anywhere and it only changes the units.

ANSWER = You write this first so it looks like you know what you are doing. That gives you a bit of time to figure out what to do next.

ANSWER = 64cal x 200ml/27.8ml x 37.5%/40%

Ok, now we check everything. This is called sanity check and it is especially important in chemistry and physics where you might have a dozen or so conversions in a single equation. We have cal above the fraction line and that appears in the answer. We have ml above and below so that cancels. We have % above and below so that cancels. When you are sure everything is right, multiply all the numbers above the line and divide by all the numbers below.

ANSWER = 64cal x 200ml/27.8ml x 37.5%/40% = 431.65cal