Question

People tend to speak more quietly in restaurants than they do when they are having an ordinary conversation. Restaurant conversation is about 45 dB. If ordinary conversation is 100 times greater than restaurant conversation, how loud is ordinary conversation?

Answer 1

Conversational speech is 65 dB as a known fact.

Using math, dB = 10 log[10] ratio
10x => 10(1) = +10 dB
100x => 10(2) = +20 dB
base is 45 dB