Asolid mass of 25g is added to a solution with the mass of 60g. the final mass of the solution is 75g. explain why the mass of the products does not equal combined reactant mass

Liquid from a brewery fermentation contains 10% ethanol and 90% water. part of the fermentation product (50,000 kg/h) is pumped to a distillation column on the factory site. under current operating conditions, a distillate of 45% ethanol and 55% water is produced from the top of the column at a rate of one-tenth that of the feed. what is the composition of the waste "bottoms" from the still?