human
Silvio was running a race that had 4 parts. The total length of the race was 74.5 kilometers. The first part of the race is 15.5 kilometers long. The second and third parts are each 21.5 kilometers long. How many kilometers is the last part of the race?
assistant
How many kilometers are the first three parts? ** 15.5 + (2 * 21.5) = <<15.5+(2*21.5)=58.5>>58.5 km
How many kilometers is the last part? ** 74.5 - 58.5 = <<74.5-58.5=16>>16 kilometers
How many kilometers is the last part of the race? ** The last part of the race is 16 kilometers.
#### 16