Four books are arranged on a shelf. The first book is 31 mm thick while the second book is 50 mm thick. The third book is 5 mm less thick than the second book, and the fourth book is twice as thick as the first book. What is the total thickness of the four books?
The third book is 50 - 5 = <<50-5=45>>45 mm thick.
The fourth book is 31 x 2 = <<31*2=62>>62 mm thick.
The total thickness of the four books is 31 + 50 + 45 + 62 = <<31+50+45+62=188>>188 mm.
#### 188