The absorbance of permanganate and dichromate standards at two wavelengths, and those of an unknown mixture of the two,

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The absorbance of permanganate and dichromate standards at two
wavelengths, and those of an unknown mixture of the two, are shown
in the table below. The cuvet size is 1.00 cm.
What is the molarity of the permanganate in the
mixture?
λ (nm)
Absorbance of 1.00 x 10-4 M
MnO4- standard
Absorbance of 1.00 x 10-4 M
Cr2O72- standard
Absorbance of unknown mixture
of MnO4- and Cr2O72-
266
0.103
0.442
0.819
320
0.163
0.156
0.436