
Alan G. answered 06/24/16
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Mulan,
Assuming the sound of the trumpets is additive, meaning that three trumpets will sound three times as intense as one, what you need to do is the following:
Find the actual sound intensity level. (Remember that dB are logarithmic measures.) Multiply the intensity by 18/3, then convert it to decibels.
Let me know if you need more help with this. I could pull out a physics formula, but I prefer using just what you have available at the moment.