Kelly blends coffee. She mixes brand A costing $6 per kg with brand B costing $8 per kg. How many kilograms of each brand does she have to mix to make 50 kg of coffee costing her $7.20 per kg?
1 Answer
Oct 11, 2017
Explanation:
This is a system of equations problem. Let's first define the variables.
Let
The total kg must be
The cost per kg of the mix must br
Now that we have our two equations, we can solve.
From the first equation, we can multiply both sides by
Subtracting, we get:
Thus, we need