If an animal requires 100 mg of medication and the concentration on the bottle is 200 mg for every 10 mL, how many mL should you administer?

To determine how many mL of medication to administer, it's essential to understand how to convert the required dosage based on the concentration of the medication available.

The concentration of the medication is 200 mg for every 10 mL. This means that each mL contains 20 mg of the medication (since 200 mg divided by 10 mL equals 20 mg/mL).

If the animal requires 100 mg of medication, you need to calculate how many mL contain that amount. To find this, you can use the formula:

Amount needed (mg) = Concentration (mg/mL) × Volume (mL)

Rearranging the formula to find the volume gives:

Volume (mL) = Amount needed (mg) / Concentration (mg/mL)

Plugging in the numbers:

Volume (mL) = 100 mg / 20 mg/mL = 5 mL

Therefore, administering 5 mL will provide the required 100 mg of medication, making this the correct answer.