A canned heat product used to warm chafing dishes consists of a homogeneous mixture of ethanol (C2H5OH)

Question:

A "canned heat" product used to warm chafing dishes consists of a homogeneous mixture of ethanol (C2H5OH) and paraffin that has an average formula of C24H50. What mass of C2H5OH should be added to 620 kg of the paraffin in formulating the mixture if the vapor pressure of ethanol at 35 oC over the mixture is to be 8 torr? The vapor pressure of pure ethanol at 35 oC is 100 torr?