SOLUTION: A pharmacist is to prepare 18 milliliters of special eye drops for a
glaucoma patient. The eye-drop solution must have a 3% active ingredient,
but the pharmacist only has 9% s
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-> SOLUTION: A pharmacist is to prepare 18 milliliters of special eye drops for a
glaucoma patient. The eye-drop solution must have a 3% active ingredient,
but the pharmacist only has 9% s
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Question 399532: A pharmacist is to prepare 18 milliliters of special eye drops for a
glaucoma patient. The eye-drop solution must have a 3% active ingredient,
but the pharmacist only has 9% solution and 2% solution in stock. How
much of each type of solution should be used to fill the prescription? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! In words:
(ml of active ingredient)/(ml of total solution) = 3%
Let = ml of 9% solution to use
Let = ml of 2% solution to use
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given: = ml of active ingredient in 9% solution = ml of active ingredient in 2% solution
(1) ml
--------------------
(2)
(2)
(2)
Multiply both sides of (1) by
and subtract (1) from (2)
(2)
(1) ml
and, from (1)
(1) ml
18/7 ml of 9% solution must be used
108/7 ml of 2% solution must be used
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check answer:
(2)
(2)
(2)
(2)
(2)
(2)
OK
