Final answer:
In a 20 mL glucose 10% solution, you have drawn up 2000 mg of glucose.
Step-by-step explanation:
To calculate the number of milligrams (mg) in 20 mL of a glucose 10% solution, we need to know the concentration of the solution. A 10% glucose solution means that there is 10 grams of glucose in 100 mL of solution. So, in 1 mL of the solution, there is 0.1 grams of glucose. Therefore, in 20 mL of the solution, there would be 2 grams of glucose, which is equal to 2000 mg.