Word problem


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



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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