With six cups of milk, and each recipe requiring 3/4 of a cup of milk, we know instantly that she can make at least six potato casseroles, with milk left over. Each recipe has a 1/4 of milk left over. With the milk left over, which is 6 1/4 cups of milk, we can make a further two more with the milk we have. So in total, we can make 8 potato casseroles with the milf left over.
Positive 3, If You're starting at -6 and you add the first 6 it's at 0, now you have 3 more to add to make 9. And that gives you positive 3. or if you do 9 - 6 you can get your answer that way too.
