Adult male frogs produce loud calls from a stationary calling position, which are detected by distant females of their species, who then approach them. Given that a male frog calls with a sound pressure level of 80 decibels (measured at a distance of 1m), that sound attenuates by 6 dB for every doubling of distance and that females need a minimum sound pressure level of 50 dB to hear the male, what is maximum distance at which a female will hear the male?
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