Omar's cookie recipe calls for 9/4 cups of flour. If the recipe was increased by a factor of 3/2, how much flour would Omar need?

27/8

11/4

15/4

13/4

To increase the recipe by a factor of 3/2, you need to multiply the original recipe amount by 3/2.

9/4 * 3/2 = 27/8

Therefore, Omar would need 27/8 cups of flour. Answer: 27/8.