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You should read the book at whatever is the most comfortable distance for you. Your eyes will get strained if you work them too hard, so it's important to be comfortable when you are reading.
8 to 12
The word sit has one syllable.
A 48 inch table has 48x48 sq inches, which is 2304 sq inches, or 16 square feet. 300/16=18.75 Stick with 18 tables. However, you don't say if you want room for people to sit around the tables. My answer doesn't leave room for people to sit around the tables. If you want room for people to sit, then I would suggest that you try setting up one table with the chairs around it with people sitting in the chairs, then measure to see how much room it takes.
Student tables at one University in Canada are 60 inches wide and 20 inches deep and two students sit at each table in a typical lecture room.