\documentclass[../main.tex]{subfiles} \begin{document} \problem{The Lucas Problem} This problem was invented by Edouard Lucas, a French nineteenth-century mathematician. \\ ``Every day at noon,'' Lucas said, ``a ship leaves Le Havre for New York and another ship leaves New York for Le Havre. The trip lasts 7 days and 7 nights. How many New York-Le Havre ships will the ship leaving Le Havre today meet during its journey to New York? Can you answer graphically? \begin{figure}[h] \centering \includegraphics[width=10cm]{255} \end{figure} \end{document}