An herbalist has 40 oz of herbs costing $4 per ounce. How many ounces of herbs costing $1 per ounce should be mixed with these 40 oz of herbs to produce a mixture costing $2.20 per ounce?

Question

An herbalist has 40 oz of herbs costing $4 per ounce. How many ounces of herbs costing $1 per ounce should be mixed with these 40 oz of herbs to produce a mixture costing $2.20 per ounce? 
 oz

Reiny · Answer

number of ounces of $1 stuff --- x 4(40) + 1(x) = 2.2(40+x) solve for x, you should get x = 60