SOLUTION: A chemist mixes one solution that is 10% alcohol with a solution that is 15% alcohol to make 100 milliliters of a solution that is 12% alcohol. How many milliliters of liquid was i

Question 696425: A chemist mixes one solution that is 10% alcohol with a solution that is 15% alcohol to make 100 milliliters of a solution that is 12% alcohol. How many milliliters of liquid was in the first solution?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = ml of 10% solution
Let = ml of 15% alcohol
given:
(1)
(2)
-----------------------------
(2)
(2)
(2)
Multiply both sides of (1) by
and subtract (1) from (2)
(2)
(1)

and, since
(1)
(1)
(1)
(1)
60 ml of 10% solution is needed
40 ml of 15% alcohol is needed
check:
(2)
(2)
(2)
(2)
(2)
OK

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