SOLUTION: Some powdered milk worth $ 2.80/kg and some cocoa worth $4.00/kg form a 20-kg mixture that is worth $68. How much cocoa is in the mixture?

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Question 860323: Some powdered milk worth $ 2.80/kg and some cocoa worth $4.00/kg form a 20-kg mixture that is worth $68. How much cocoa is in the mixture?
Answer by josgarithmetic(39614) About Me  (Show Source):
You can put this solution on YOUR website!
You mean, highlight%2868%28dollars%2Fhighlight_green%28POUND%29%29%29.

Your equations would be like this:
L = 2.80
H = 4.00
M= 20 kg final mixture
T = 68
u = how much of milk powder
v = how much of cocoa
-
highlight%28%28Lu%2BHv%29%2FM=T%29 and highlight%28u%2Bv=M%29

For a more complete discussion and solution to the system to find u and v, check this lesson: Mixture: Two-Part, price or cost, both material amounts unknown