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A biologist has a 40% solution and a 10% solution of the same plant nutrient. How many cubic centimeters of each solution should be mixed to obtain 25 cc of a 16% solution?

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sqdancefan
The proportion of 10% solution is
.. (40 -16)/(40 -10) = 24/30 = 4/5

(4/5)*25 cc = 20 cc of 10% solution are needed.
(1/5)*25 cc = 5 cc of 40% solution are needed.

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