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Difficult redox calculation

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Clifj029:
anyone know how to attempt this and get the answer?
Calculate the masses of anhydrous Iron(II) and Iron(III) sulphate present in 1dm3 Of solution from the following results:
25cm3 of the solution was oxidised by 23.0cm3 of 0.02mol dm-3 KMnO4
After reduction by zinc and dilute sulphuric acid, 25.00cm3 of the solution required 40.0cm3 of the same KMnO4 solution.
(Fe = 55.8, S=32.1, O=16.0)
(Use MnO4^- + 8H+ 5e- -> Mn^2+ 4H2O)

billnotgatez:
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