How many pounds of coffee worth 8 a pound should be added to 30 pounds of coffee worth 4 a pound to get a mixture worth 6 a pound

Question

I need help figure how how to solve problem

 

Answer 1

8(x) + 4(30) = 6(x + 30)

8x + 120 = 6x + 180

2x = 60

x = 30

 

So 30 pounds of coffee worth 8 a pound.