If we take 48 and we subtract 64 from 48, we get negative 16, is that right? Yes, we get negative 16. Then if we add 24 to negative 16, you get positive 8. Positive 8 minus 3 is 5. 5 plus 8 is 13. 13 minus 6 is 7. This whole numerator simplifies to 7, so we get 7 pi over 6 as our volume.