human
If a vehicle is driven 12 miles on Monday, 18 miles on Tuesday, and 21 miles on Wednesday. What is the average distance traveled per day?
assistant
How many miles are covered from Monday to Wednesday? ** The total distance covered from Monday to Wednesday is 12 + 18 + 21 = <<12+18+21=51>>51 miles.
What is the average distance traveled per day? ** So the average distance traveled per day is 51/3 = <<51/3=17>>17 miles.
#### 17