Liquid benzene and liquid n-hexane are blended to form a stream flowing at a rate of 700lbm/h. An on-line densitometer (an instrument used to determine density) indicates that the stream has a density of 0.850g/mL. Using specific gravities from Table B.1, estimate the mass and volumetric feed rates of the two hydrocarbons to the mixing vessel (in American engineering units). State at least two assumptions required to obtain the estimate from the recommended data.