Heard at a certain distance, a car horn emits a sound with a loudness of 50 dB. If instead there were 100 identical cars all sounding their horns at this certain distance, how loud would the sound be

70db

Explanation:

If one typewriter 's sound recorded 60 dB, therefore 10 typewriters that clack away would register 70 dB (doesn't seem 600 dB!), but it would only sound double as loud as compared with one typewriter. You would gathers typesetters to strike a noise level of 80 dB and jointly they will only sound four times as loud as compared single typewriter.

So, it would be

= 20 + 50

= 70db