human
Tony read 23 books, Dean read 12 books and Breanna read 17 books. Tony and Dean read 3 of the same books and all three had read the same book as well. In total how many different books have Tony, Dean, and Breanna read?
assistant
How many books did Tony and Dean read together? ** Tony and Dean together read 23 + 12 = <<23+12=35>>35 books
How many unique books did Tony and Dean read together? ** 3 of these books were duplicates so Tony and Dean together read 35 - 3 = <<35-3=32>>32 unique books
How many books did Tony, Dean, and Breanna read in total? ** All three read 32 + 17 = <<32+17=49>>49 books
How many extra times is the book counted? ** Because the books are being counted three times, the book is counted 3 - 1 = <<3-1=2>>2 extra times.
How many different books have Tony, Dean, and Breanna read? ** All together they have read 49 - 2 = <<49-2=47>>47 different books
#### 47