In this task you are given a story and a question regarding that story. You must judge whether the question is answerable based on the info given to you. Label the instances as "Answerable" or "Not Answerable" based on your judgment. the story and the question are separated by a new line character.

Pat bought a ruler at an office supply store. He began to measure things for an experiment. Pat suspected that the ruler was not accurate. He took out a second ruler to compare the two. He found that his new ruler was slightly shorter than his old one.
Why did He find that his new ruler was slightly shorter than his old one?
Answerable