math question

A pharmacist asks you to compound 1 Liter of Dextrose 30%. You have on hand Dextrose 70%, and Dextrose 5%. How many ml of each must be used to compound this solution?

Answer:

You would use an Alligation to solve this pharmacy math problem.

70%------25 parts 70%
---\----/---
-----30%---
---/----\---
5%-------40 parts 5%

Divide 25 by 65 (25 + 40) and you get a total of 0.384

Multiply this by 1000 and you get 384 ml of the 70% solution.

Divide 40 by 65 and you get .616 Multiply this by 1000 and you get 616 ml of the 5% solution.

Thanks for your question!