SOLUTION: a pharmacist has 10% and 30% alcohol solutions instock. to prepare 200mL of 25% solution how much should a pharmacist mix?

Question 742877: a pharmacist has 10% and 30% alcohol solutions instock. to prepare 200mL of 25% solution how much should a pharmacist mix?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = mL of 10% solution needed
Let = mL of 30% solution needed
= mL of alcohol in 10% solution
= mL of alcohol in 30% solution
-----------------
(1) mL
(2) mL
---------------------
(1)
(1)
-------------------
Subtract (2) from (1)
(1)
(2)

and, since
(2)
(2)
-------------
50 mL of 10% solution is needed
150 mL of 30% solution is needed
check:
(1)
(1)
(1)
(1)
OK

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