Jerry works for the local supermarket, and he is responsible for collecting and storing the shopping carts. The shopping carts are stored by stacking them in a long row of carts. His boss wants him to answer
some questions in order to find a place to store them. Jerry measured the length of one cart and found
out that it was 36 inches. Then he measured the length of six stacked shopping carts and found out that it
was 71 inches.

36 inches
71 inches
What is the length of three carts stacked together? Give your answer in inches.