An unknown mass of each of the following substances, pyrex glass (Tf= 55.55 degree celsius) and Sand (Tf= 62 degrees celsius), initially at 21.0,…

An unknown mass of each of the following substances, pyrex glass (Tf= 55.55 degree celsius) and Sand (Tf= 62 degrees celsius), initially at 21.0, absorbs 1980 of heat. The final temperature is recorded as indicated. Find the mass of each substance.