Which of the semi-trailers in the picture has three axles?

- 17
- 15
- Correct answer: 16
- 14
Why this is the answer
The correct answer in the official bank: 16
A semi-trailer rests its front part on the towing vehicle, so you count only the axles under the semi-trailer itself, at its rear. In 16 there are three wheels in a row there, which means three axles. In 17 there are two wheels there and in 14 there is one wheel, and 15 is a drawbar trailer, not a semi-trailer.