16. (6 points) A road is 400 meters long, and on both sides of the road, a trash can is placed every 20 meters, with the start and end points being bus stops where no trash cans are placed. How many trash cans are placed in total?
【Solution】Solution: $400 \div 20-1$
$$
\begin{array}{l}
=20-1 \\
=19 \text { (units) } \\
19 \times 2=38 \text { (units) }
\end{array}
$$

Answer: A total of 38 trash bins need to be placed.