The doctor finally figures out wha is wrong with you and prescribes a medicine that will return you to full health.  The order is for 25 mg of the medicine.  The nurse walks in with a liquid and you ask to see the bottle.  The bottle says 100 mg of medicine per 15 ml of liquid. How many millilitiers should she give you?  Would she need to bring that to you in a dropper, a little cup, a glass or a large bottle?

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