Final answer:
Umpt will eat 12/75 slices of pie.
Step-by-step explanation:
To find out how many slices Umpt will eat, we can use a fraction calculation. Umpt plans to eat 3/5 of a pie. To determine the number of slices, we need to divide 3/5 by 15/4. To divide fractions, we multiply the first fraction by the reciprocal of the second fraction. In this case, it would be (3/5) * (4/15). Multiplying the numerators together gives us 12, and multiplying the denominators gives us 75. So Umpt will eat 12/75 slices of pie.