Question

A doctor orders 25 mg of medication for a patient. The medication is available as a liquid

with 100 mg of medication per 20 mL of liquid. What is the correct dose in mL?

Answer 1

5 ml

Explanation:

Given:

• 100 mg of medication per 20 ml of liquid
• 25 mg of medication needed by patient

Let x = amount of liquid needed in ml

To find the value of x, set up a ratio of medication to liquid:

⇒ 100 mg : 20 ml = 25 mg : x ml

⇒ 100/20 = 25/x

⇒ 5 = 25/x

⇒ 5x = 25

⇒ 5x ÷ 5 = 25 ÷ 5

⇒ x = 5

Therefore, the correct dose is 5 ml