SOLUTION: The Coffee Counter charges $7 per pound for Kenyan French Roast coffee and $6 per pound for Sumatran coffee. How much of each type should be used to make a 20 pound blend that sell

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Question 1073013: The Coffee Counter charges $7 per pound for Kenyan French Roast coffee and $6 per pound for Sumatran coffee. How much of each type should be used to make a 20 pound blend that sells for $6.60 per pound?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
1.A%2BB=20
.
.
.
600A%2B700B=660%28A%2BB%29
600A%2B700B=660%2820%29
600A%2B700B=13200
2.6A%2B7B=132
Multiply eq. 1 by 6 and subtract from eq. 2,
6A%2B7B-6A-6B=132-120
B=12
Now use either equation to solve for A.