A baker has a bag with 20 cups of flour. The baker plans to use the flour to make 4 loaves of bread. Each loaf of bread uses 3 1/3 cups of flour.

To find the total amount of flour used to make 4 loaves of bread, we need to multiply the amount of flour used per loaf by the number of loaves:

3 1/3 cups of flour per loaf x 4 loaves = 13 1/3 cups of flour

Therefore, the baker will use 13 1/3 cups of flour to make the bread.

To find the amount of flour remaining in the bag, we need to subtract the amount used from the original amount:

20 cups of flour - 13 1/3 cups of flour = 6 2/3 cups of flour

Therefore, the baker will have 6 2/3 cups of flour remaining in the bag when finished making the bread.