Question

A recipe that makes 6 servings calls for cup of sugar. Arlene modifies the recipe so that it can serve 9. How many cups of sugar does Arlene need?

Answer 1

6 servings = 1 cup       
3 servings = 1/2 cup

6+3=9 servings total.
1+1/2 = 1 1/2 cups of sugar total needed for 9 servings.
Hope this helps :)