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Homework Help: Word problem

  1. Sep 6, 2005 #1

    Zed

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    Word problem !!

    Hi ,

    This is a Hw question i have am stuck on i dont know how to solve it ...

    A pharmacist is to prepare 16 milliliters of special eye drops for a glaucoma patient. The eye-drop solution must have a 5% active ingredient, but the pharmacist only has 10% solution and 1% solution in stock.


    How much of 10% solution should be used to fill the prescription?

    How much of 1% solution should be used to fill the prescription?


    plz help

    thx
     
  2. jcsd
  3. Sep 6, 2005 #2

    Alkatran

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    Science Advisor
    Homework Helper

    convert to formulas:
    The amount of active solution in each ingredient should sum to the total active solution:
    x*.1 + y*.01 = 16*.05
    The amount of each ingredition should sum to the total amount:
    x + y = 16

    Then solve.
     
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