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A tuning fork having n = 300 Hz produces...

A tuning fork having n = 300 Hz produces 5 beats/s with another tuning fork. If impurity (wax) is added on the arm of known tuning fork, the number of beats decreases then calculate the frequency of unknown tuning fork.

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The frequency of unknown tuning fork should be `300 pm 5 = 295 Hz or 305 Hz`
When wax is added, it is would be 305 Hz, beats would have increases but with 295 Hz beats is decreases so frequency of unknown tuning fork 295 Hz.
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ALLEN -WAVES AND OSCILLATIONS-Part-1(Exercise-05)[B]
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