SOLUTION: A Pharmacist needs 500 millilters of a 20% phenobarbital solution but only has 5% and 25% phenobarbital solutions available. Find how many milliliters of each solution he should mi

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Question 673813: A Pharmacist needs 500 millilters of a 20% phenobarbital solution but only has 5% and 25% phenobarbital solutions available. Find how many milliliters of each solution he should mix to get the desired solution.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

Mixing Algebraically

 .05(500-x) + .25x = .20·500ml

       .20x = .15· 500ml

          x = 375mm, amount of 25%  and 125ml of the 5%