SOLUTION: A chemist needs to mix 20 liters of 40% salt solution with some 70% solution to get a mixture that is 50% salt. How many liters of 70% solution should be used?
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Question 147292: A chemist needs to mix 20 liters of 40% salt solution with some 70% solution to get a mixture that is 50% salt. How many liters of 70% solution should be used? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! In words:
(amount of salt you end up with) / (total amount of solution) = % salt
Let = amount of 70% solution to be added
How much salt is in the 20 liters of 40% solution? liters
How much salt is in the 70% solution?
How much total solution do you end up with?
So, the equation to use is:
multiply both sides by
The chemist needs to add 10 liters of the 70% solution
check answer:
OK
