First, we need to determine the profit per book. To do this, we perform 20-5=<<20-5=15>>15 dollars in profit per book.
Next, we divide the total sales by the profit per book, performing 120/15=<<120/15=8>>8 books sold in total.
Since the books are sold 2 at a time, we divide the number sold by 2 to find the total number of people sold to, performing 8/2=<<8/2=4>>4 people in total.
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