chemistry abs spectrum and wavelength

Hello, can someone please help me? I'm stuck on a question:

I'm doing an analysis of the absorbance of FeSCN2+ at it's max wavelength (i.e. 450nm where abs=0.154)The species I used to make the solution tested were Fe(NO3)3, HNO3, and KSCN.

Now, the question is: Suppose there are one or more interfering species in the solution, which also absorb more or less strongly at this same wavelength. How could/should you deal with such a situation of overlapping absorbances?

I've scanned all my notes and I'm still stuck. I think it may have something to do with finding the equilibrium concentrations and then converting values using a ratio formula using the absorbance and concentration values...
A/A = C/C? I think i may be wrong, can someone please explain this theory question to me?

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