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If a large housefly 3 m away from you makes a noise of 43 dB, what is the noise level of 1200 flies at that distance, assuming interference has a negligible effect?

Noise level of 1200 flies = ??dB

HELP: Using the formula for decibels and the given information, you can calculate the ratio I / I0 for 1 fly.

HELP: If you assume that 1200 flies make 1200 times as much noise as 1 fly, what is I / I0 for 1200 flies?

1 answer

1200 flies will have 1200 times the sound power or one at the same distance

10 log(10)1200 = 3.1 x 10 = 31 dB more than 43 db, or 74 dB

I don't understand the last hint.
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