I'm really clueless on how to answer this question! If anyone can help me out on this, that would be awesome!

In an experiment, a series buffer solution is made by mixing V (CH3COO- mL) of 0.500M acetate and V(CH3COOH mL) of 0.500 M acetic acid together. Show algebraically why this will always result in:

 [CH3COO-]/[CH3COOH] = V(CH3COO-)/V(CH3COOH)

Where [CH3COO-] and [CH3COOH] are the equilibrim concentrations in the buffer.