\documentclass[a4paper]{article}

\usepackage{a4wide,color,Sweave,url,amsmath}
\newenvironment{question}{\item \textbf{Problem}\newline}{}
\newenvironment{solution}{\textbf{Solution}\newline}{}
\newenvironment{answerlist}{\renewcommand{\labelenumi}{(\alph{enumi})}\begin{enumerate}}{\end{enumerate}}
\setlength{\parindent}{0in}
\providecommand{\tightlist}{\setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}

%% using tex4ht
\DeclareGraphicsExtensions{.pdf,.png,.jpg}

\begin{document}
%% \exinput{latex}
\end{document}
