Mining Engineering > GATE 2019 > Mine Safety
Three equipment A, B, and C located side by side and operating simultaneously produce a sound power level of 77.5 dB. The sound power levels of A and B are 68 dB and 70 dB respectively. The sound power level of C (rounded off to one decimal place) in dB, is __________.

Explanation

Correct : 75.5

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