Math Dosage calculations

Question

If 20 g of pure drug are added to a container of sterile water, and the total volume of this solution is 50 mL, what would be the strength of this solution expressed as a ratio and as a percent?

Answer 1

The total amount of liquid is 50ml. There is 20g of drug that is in the solution.

20g/50ml or 2/5 ratio would represent the strength of the solution

2/5 is 40% so the solution has 40% strength