Theophylline, an asthma medicine, is to be prepared from an elixir with a drug concentration of 5 mg/ml and a cherry-flavored syrup that is to be added to hide the taste of the drug. how much of each must be used to prepare 100 milliliters of solution with a drug concentration of 2 mg/ml?

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Explanation:

Well, we need 100ml of solution, with a concentration of 2mg/ml. So the total amount of drug we need is :

But the drug concentration is  5mg/ml, so the amount of elixir needed to get 200mg of drug is:

And so the amount of cherry flavoured syrup needed is:

Hope my answer helps.

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