SOLUTION: Forty liters of a 60% salt solution are diluted to produce a 45% solution. How much must be drained and replaced with distilled water so that the resulting solution will contain on

Question 961475: Forty liters of a 60% salt solution are diluted to produce a 45% solution. How much must be drained and replaced with distilled water so that the resulting solution will contain only 45% salt?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = liters of 60% solution to be
drain off and replaced with water
------------------------------------
= liters of salt in the 60% solution
that is drained off
--------------------------------------
liters of salt to begin with
--------------------------------------

--------------
10 liters of solution should be drained off
and replaced with water
----------------------
check answer:
The total water you end up with is:

liters
plus the I added = liters of water
I've still got liters total, so my concentration is:

OK
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