我觉得这题出错了。麻烦TX们看下。
Delux coffe is to be mixed in with regular coffee to make at last 50 pounds
of blended coffee. The misture must contain at least 10 pounds of deluxe
coffee. Deluxe cost $6 a pound. regular coffee is $5 a pound. How many
pounds of each kind of coffee should be used to minimize costs?
这还用说，当然是Delux就10pounds,要不怎样？还放三聚氰胺吗？
