An herbalist has 30 oz of herbs costing $2 per ounce. how many ounces of herbs costing $1 per ounce should be mixed with these 30 ounces of herbs to produce a mixture costing $1.60 per ounce?

Answer 1

30x2+Ax1=(30+A)1.6
60+A=48+1.6A or 0.6A=12 or A=20.
Total mix=50oz and cost=30*2+20=80$
Or 80/50=1.6$/oz.