Final answer:
An 80-decibel sound is ten times louder than a 60-decibel sound.
Step-by-step explanation:
An 80-decibel sound is ten times louder than a 60-decibel sound. Each factor of 10 in intensity corresponds to 10 dB. So, when the sound intensity is increased by a factor of 10, the sound intensity level increases by 10 dB. For example, a 90 dB sound compared to a 60 dB sound is 30 dB greater, which is three factors of 10 or 10³ times as intense.