A pharmacist has a 12% solution of boric acid and a 20% solution of boric acid. How much of each must he use to make 80 grams of a 15% boric acid solution

Explanation:

Call x the amount of 12% boric acid solution to be used.

Since he wants to make 80 grams of solution, the amount of 20% boric acid solution to be used is 80 - x.

The final solution is 15% concentrated.

Now you have can write your equation:

Solve:

That is 50 grams of the 12% solution of boric acid.

Calculate the amount of the 20% solution of boric acid:

That is 30 grams.

Then, he must use 50g of the 12% solution and 30 g of the 20% solution.

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