A Guide to Intermittent Fasting

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It is incorrect because dx/dt is not the accumulation of salt in the tank. dy/dt is.
 
hydrogen1 said:
It is incorrect because dx/dt is not the accumulation of salt in the tank. dy/dt is.

Thts what I am asking whynt it ain't the accumulation term; verbally explain please
 
y is the concentration of the output stream always. Which is also the concentration in the tank always in a mixing process. y always represents the concentration inside the tank and x does not. See what I mean?