Posted by Valeria on .
The Coffee Counter charges $9.00 per pound for Kenyan French Roast coffee and $8.00 per pound for Sumatran coffee. How much of each type should be used to make a 20lb blend that sells for $8.40 per pound?
Here are the 2 equations (or system of equations) I created:
K = lbs of Kenyan French Roast coffee
S = lbs of Sumatran coffee
k + s = 20
9k + 8s = 8.40
I then multiplied the top equation by 8 so I could do the elimination method to solve.
That got made k+s=20 into 8k + 8s = 160.
Of course, when I added those two equations together, I got k = 151.6, which couldn't possibly be right.
Are my two equations right, and can you see where I went wrong?
Thanks,
¢¾ Valeria ¢¾

Algebra 
marcie,
your final cost for the 20 lb blend will be $168. K=$9 and S=$8. you have to find out how many pound of k plus how many pounds of s will equal 20 pounds and $168

Algebra 
Reiny,
You are making the same error as you did in your post at 5:26 pm
make your last equation 9k + 8s = 8.40(20)
(I got k=8, s = 12)