SOLUTION: In my problem a farmer needs 450lbs of chicken feed mixture that is at least 15% protein. The two feeds available are Feed A, which is 18% protein and Feed B, which is 10% protein.

Question 335595: In my problem a farmer needs 450lbs of chicken feed mixture that is at least 15% protein. The two feeds available are Feed A, which is 18% protein and Feed B, which is 10% protein. Rounded to the nearest pound, how many pounds of each type of feed should he order if he wants 450lbs of a mix that is 15%protein?
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Let A be the amount of feed A, B the amount of feed B.
.
.
.
Total weight equation
1.
.
.
.
Concentration equation

2.
.
.
.
From eq. 1,

Substitute into eq. 2,

Then from eq. 1,

.
.
.
To the nearest pound,
A=281 lbs
B=169 lbs
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