Mixing feed: A milling company wants to mix alfalfa, which contain 20% protein, andwheat mids, 28 which contain 15% protein, to make cattle feed. a. If you make a mixture of 30 pounds of alfalfa and...

Mixing feed: A milling company wants to mix alfalfa, which contain 20% protein, andwheat mids, 28 which contain 15% protein, to make cattle feed.

a. If you make a mixture of 30 pounds of alfalfa and 40 pounds of wheat mids, how many pounds of protein are in the mixture? (Hint: In the 30 pounds of alfalfa there are 30 × 0.2 = 6 pounds of protein.)

b. Write a formula that gives the amount of protein in a mixture of a pounds of alfalfa and w pounds of wheat mids.

c. Suppose the milling company wants to make 1000 pounds of cattle feed that contains 17% protein. How many pounds of alfalfa and how many pounds of wheat mids must be used?