A barista averages making 16 coffees per hour. At this rate, how many hours will it take until she's made 1,200 coffees?
To solve the problem, simply set up a proportion using what you know and using x for what you don't know:
Cross-multiply, and you have:
16x = 1200
Divide both sides by 16 to isolate x and you have:
x = 75