The higher the percentage of the active ingredient in a drug

The higher the percentage of the active ingredient in a drug, THE FASTER IT WILL REACH THE BLOOD STREAM. Active ingredient refers to the component part of a pharmaceutical drug that is biologically active and which react with necessary substrates in the body to bring about the desired effect. The blood stream generally serves to transport the drug to the its site of action, thus the higher the concentration of the active ingredient in the drug, the quicker it will get to the blood stream. 

It would be (at) + cu (s)

So what you would do is go through and add 3 teaspoons(tsp) 6 times because of the 6 tablespoons(tbsp). which will give you an answer of 18. another way is to multiply 3x6=18.