At her current production level, she can increase her production of cheese by 5 grams, if she reduces her production of milk by one liter. Alternatively, she can increase her production of milk by one liter if she decreases her production of cheese by 5 grams. This means that the opportunity cost of milk is 5 grams of cheese per liter of milk.
If you turn this measure of cost around, what is the opportunity cost of cheese in liters of milk per gram of cheese?