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Question 263158: A chemist wants to make a 10% solution of fertilizer. How much water and how much of 30% solution should the chemist mix to get 30 L of a 10% solution?
Answer by oberobic(2304)   (Show Source):
You can put this solution on YOUR website! In solving solution problems, you always want to determine how much "pure stuff" you'll need.
You're told you need 30 L of 10% solution, so that means 3 L of pure fertilizer + 27 L of water.
You're told you have some 30% solution.
So the amount of pure stuff we need will be:
.3x = 3
x = 10
So, 10 L of the 30% solution will contain 3 L of fertilizer.
But you need 30 L in total, so add 20 L of water.
Then you'll have 30 L that contains 3 L of fertilizer, which is the desired 10% solution.
Done.
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