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**Chem/Math !! Help !!**

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