Please explain how they got the grey highlighted answer. Thanks!

17) I had started using that liquid sugar, which was just sugar dissolved in water. It is really thick because of all the sugar dissolved in it. However, I was drinking water in the lab and accidentally, I think, put in some ethylene glycol that I was using for an experiment in my tea. Anyway, idiocy aside, I wanted to test the solutions boiling point and freezing point to see if I had put any in, as it would taste sweet no matter what. Ethylene glycol (EG), CH2(OH)CH2(OH), is a common automobile antifreeze. It is water soluble and fairly nonvolatile (b.p. 197C ). Calculate the boiling point and freezing point of a solution containing 455.5g of ethylene glycol in 3707g water. Assume this solution is only water and EG. New BP =101.3C New FP=3.68C