SOLUTION: A pharmacist mixed some 10%-saline solution with some 15%-saline solution to obtain 100 mL of a 12%-saline solution. How much of the 10%-saline solution did the pharmacist use in t

Question 606141: A pharmacist mixed some 10%-saline solution with some 15%-saline solution to obtain 100 mL of a 12%-saline solution. How much of the 10%-saline solution did the pharmacist use in the mixture?

Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = ml of 10% solution needed
Let = ml of 15% solution needed
= ml of salt in 10% solution
= ml of salt in 15% solution
----------------
(1)
(2)
----------------
(1)
(1)
Multiply both sides of (2) by
and subtract (2) from (1)
(1)
(2)

and, since
(2)
(2)
(2)
(2)
60 ml of 10% solution is needed
check answer
(1)
(1)
(1)
(1)
OK

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