The conversion factor shows 2 blocks on the right and three 1 pound blocks on the left. It takes two 1 pound blocks to make 2 and then you get your 3rd block, making it 3 (.5 more than 2.5) needing another block to add a .5
The following formula is used to find the answer. D = 50 mg (0.6^n) D is the dosage n is at any hour Using this formula and solving the equation for it, the answer is 18.
