30oz herbs cost

Question

 30oz herbs cost $2 per oz. How many ounces costing $1 per ounce should be mixed with the 30 oz to produce a mixture costing $1.60 per oz?

Answer 1

let x = the number of oz. of $1 herbs

 

We have the following equation

 

30(2) + x(1) = (30 + x)(1.60)

 

60 + x = 48 + 1.60x

 

12 + x = 1.60x

 

12 = 0.6x

 

20 = x

 

20 oz of $1/oz. herbs should be mixed with the 30 oz of herbs