<PRE><B>Question 171358</B>
    An herbalist has 30 ounces of herb costing $2.00 per ounce. How many ounces of herbs costing $1.00 per ounce should be mixed with the 30 ounces to produce a misture costing $1.60 per ounce?
.
Let x = amount of  $1.00  per ounce herb added
.
2(30) + 1(x) = 1.60(30+x)
60 + x = 48 + 1.60x
60 = 48 + .60x
12 = .60x
20 ounces = x (amt added)
</PRE>