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*how*to do the type of problem in general. Here goes:

A clarinet plays a soft note with a SIL of 40 dB. By what factor must the intensity be increased in order to play the same note at a SIL of 70 dB.

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If the whirring of a single fan produces a SIL of 50 dB, how many identical fans would need to be operated simultaneously to make a SIL of 63 dB?

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A 100-Hz sawtooth wave and a 202-Hz sine wave are sounded simultaneously. What is the frequency of the resulting beats?

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I just need formulas, really.