Consider a mixture of methanol (55%), formaldehyde (23%) and a variety of other solvents. If the other solvents have an average density of 0.831 g/cm³, estimate the density of the mixture a) assuming volume additivity and b) assuming average of the pure-component density. The density of methanol and formaldehyde are 798 kg/m³ and 815 kg/m³, respectively.

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