Final answer:
They each need 10 cups of flour.
Step-by-step explanation:
To find out how much flour they each need, we need to know the number of cups of sugar in the 20-cup bag. Since they divide the bag evenly, each of them will have 20/2 = 10 cups of sugar.
Now, let's consider the recipe for pound cake which requires 1 pound of sugar and 1 pound of flour. Since both Jaleel and Angel have 10 cups of sugar each, they would also need 10 cups of flour each to make their recipes.