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

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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If you make a mixture of 25 pounds of alfalfa and 40 pounds of wheat mids, how many pounds of protein are in the mixture? (Hint: In the 25 pounds of alfalfa there are 
25 ✕ 0.2 = 5
 pounds of protein.)
Step 1
Because alfalfa is 20% protein, in 25 pounds of alfalfa we have the following amount of protein.
Alfalfa protein  =  20% of 25
   =   ✕ 25
   =   lbs

Because wheat mids are 15% protein, in 40 pounds of wheat mids we have the following amount of protein.
Wheat mids protein  =  15% of 40
   =   ✕ 40
   =   lbs

So altogether there are  pounds of protein in the mixture.

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