The total ratio representing the slices of pizza that Buzz bought is 5+8=<<5+8=13>>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 = <<8/13*78=48>>48 slices

Twenty less the number of slices of pizza that the waiter ate is 48-20 = <<48-20=28>>28

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
28
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?
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