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1. Approximately 1.02lb of arabica coffee should be mixed with 5lb of robusta coffee to make a coffee blend that costs $12.00 per pound.

   Let x lb be the amount of arabica coffee that should be mixed with 5lb robusta.

   Thus, total cost of Arabica coffee= $28*x

   and since cost of robusta coffee per pound is $8.75, thus cost for 5lb= $8.75*5= $43.75

   also, total amount of coffee for coffee blend = x+5

   thus, total cost for coffee blend= $12(x+5)

   Since, Arabica+ Robusta= Mixture

      ⇒ $28*x + $43.75 = $12(x+5)

      ⇒ $28*x + $43.75 = $12x + $60

      ⇒ $28*x – $12x = $60 – $43.75

      ⇒$16x = $ 16.25

      ⇒ x = 1.0156 ≈ 1.02lb

   hence, 1.02 pounds of arabica coffee should you mix with 5 pounds of robusta coffee to make a coffee blend that costs $12.00 per pound

   The question is incomplete, complete question is as follows:

   Arabica coffee costs $28 per pound and Robusta coffee costs $8.75 per pound. How many pounds of Arabica coffee should you mix with 5 pounds of Robusta coffee to make a coffee blend that costs $12.00 per pound?

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