system
Given the following post, respond as if you're commenting on Reddit:
human
A person is singing at 75 decibels. Another joins in singing at 75 dBs as well. How is their sound measured collectively in decibels?

At what rate does the measure of the sound of something increase? Surely, two people singing at 75dB aren't producing sounds of 150 dB or 5,625 dB.

The fact that the example I used was of people singing is irrelevant. I am just interested in the perception of sounds and the the effect of volume when they are simultaneously being produced.
gpt
The decibel system is logarithmic. That means that the intensity would have to increase tenfold for the rating to go up by ten. If two people are singing such that alone each would produce 75 dB at a given distance, intensity has doubled and the number of decibels would increase by ten times the logarithm of two, which is about 3. So 78 dB.