SOLUTION: a dairy man wants to mix a 35% protein supplement and a standard 15% protein ration to make 1800 pounds of a high-grade 20% protein ration. How many pound of each should he use?

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Question 976378: a dairy man wants to mix a 35% protein supplement and a standard 15% protein ration to make 1800 pounds of a high-grade 20% protein ration. How many pound of each should he use?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
This could be done using just ONE variable, but here is a lesson using two unknown variables.

Lesson: Two Part Mixture, both quantities unknown
http://www.algebra.com/my/Mixtures%3A-All-in-Symbols.lesson?content_action=show_dev