Question

An insulated cooler holds 184 ounces of lemonade. How many full 12.4 ounce glasses of lemonade can be poured from the cooler?

Answer 1

Yes, you are right divide 184/12.4 = 14.8 . In this case you will round up  because the number after the decimal point is more than five. Your answer will be 15 glasses.   

Answer 2

You're right, that's the required operation.
$\frac{184}{12.4}=15.08$
Because they want to know how many glasses can be full, the answer is 15.