Human: If Buzz bought a pizza with 78 slices at a restaurant and then decided to share it with the waiter in the ratio of 5:8, with Buzz's ratio being 5, what's twenty less the number of slices of pizza that the waiter ate? Assistant:
The total ratio representing the slices of pizza that Buzz bought is 5+8=13
If he shared the slices of pizza with the waiter, the waiter received a fraction of 8/13 of the total number of slices, which totals 8/13 * 78 = 48 slices
Twenty less the number of slices of pizza that the waiter ate is 48-20 = 28