A druggist has two mixtures of a certain chemical and water, one containing 10% of the chemical and the other containing 40% of the chemical. How much of each mixture should he use to make 10 ounces that contain 25% of the chemical? 0.5 2.5 5

 5 pounds of each mixture should he use to make 10 ounces that contain 25% of the chemical.

Explanation:

where,

and are the concentrations of mixing chemicals which are 10 % and 40 % respectively

is the concentration of resulting solution = 25 %

and are the mass of mixing chemicals which are x and (10-x) ounces respectively

is the mass of resulting solution = 10 ounces

(10-x)= (10-5) = 5 pounds

Thus 5 pounds of each mixture should he use to make 10 ounces that contain 25% of the chemical.

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