Pseudoephedrine elixir contains 30 milligrams per teaspoon. the daily retail sales limit for pseudoephedrine is 3.6 grams. how many ounces of elixir is equivalent to 3.6 grams?

20 ounces

To solve this question, you need to convert the unit multiple times.
Pseudoephedrine elixir contains 30 milligrams per teaspoon and its sales limited to 3.6grams daily. If 1 ounce equal to 6 teaspoons, then 3.6gram will be equal to:
3.6 grams * (1000mg/gram) / (30 mg/teaspoon) / (6 teaspoon/ounce) = 20 ounces