<PRE><B>Question 495706</B>
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. 
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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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Equation:
theo + theo = theo
5x + 0*(100-x) = 2(100)
4x = 200
x = 50 ml (amt. of 5mg/mL needed)
100-x = 50 ml (amt of syrup needed)
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Cheers,
Stan H.

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