SOLUTION: Calculate how much 1% salt solution must be mixed with how much 5% salt solution to make 100 milliliters of 2% salt solution. You'll need ___ milliliters of the 5% salt solution.
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Question 1087123: Calculate how much 1% salt solution must be mixed with how much 5% salt solution to make 100 milliliters of 2% salt solution. You'll need ___ milliliters of the 5% salt solution. Answer by ikleyn(52781) (Show Source):
Let x be the amount (the volume in milliliters) of the 5% solution to be mixed.
Then the volume of the 1% solution is 100-x milliliters.
Then your "concentration" equation is
= 0.02,
or, equivalently,
100-x + 5*x = 200,
which implies
4x = 100 ----> x = = 25.
Answer. 25 milliliters of the 5% solution must be mised with 100-25 = 75 milliliters of the 1% solution.
