To MCATers using EK books (Re: Dopplers Effect)

[Persistence101]

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I'm having a hard time understanding EK's Doppler Effect equation: delt f/f (s)=v/c

I know how to solve for the frequency the observer hears the sound if f(s), v, and c were given. but how can I solve for f(s) if only f(o), v and c were given. Thanks!