Tingting was going to make noodles by herself. He mixed the noodles first. Her mother prepared two kilograms of flour and five hundred grams of water, but they were not suitable for making them.
Answer: 20℃ Analysis: Q＝cm△t △t＝Q/cm＝168000J/4200J/(kg·℃)×0.5kg＝80℃ And: △t＝t－to That is: to＝100℃－80℃
=20℃