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The cruising sound level in the cabin of a particular jet airliner is 60 dB, but the cabin sound level at take-off is 90 dB.

The cruising sound level in the cabin of a particular jet airliner is 60 dB, but the cabin sound level at take-off is 90 dB. Approximately how many times louder is the cabin take-off sound level compared to the cabin cruising sound level? (Enter a number only -- no symbols)

1000 and 1.5 are not the answer

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