How many pounds of coffee were used?

Question

Donna's coffee shop makes a blend that is a mixture of two types of coffee. Type A coffee cost Donna $4.30 per pound, and type B coffee costs $5.35 per pound. This month, Donna made 136 pounds of the blend, for a total cost of $668.80. How many pounds of type A coffee did she use?

Answer 1

Let A = number of lbs of Type A coffee

B = number of lbs of Type B coffee

we know from the information given that A + B = 136

and 4.30A + 5.35B = 668.80

Solving simultaneously, you find that A = 56 lbs and B = 80 lbs