word problem

Question

A coffee company wants a new flavor of Cajun coffee. How many pounds of coffee worth $ 9
a pound should be added to 30
pounds of coffee worth $ 3
a pound to get a mixture worth $ 7
a pound?

Answer 1

let x = the number of lb of $9/lb coffee

 

9x + 3(30) = 7(x + 30)

9x + 90 = 7x + 210

2x = 120

x = 60

 

The company should add 60 lb of $9 coffee