s13.tex

\documentclass[12pt,letterpaper,boxed]{hmcpset}
% set 1-inch margins in the document
\usepackage[margin=1in]{geometry}
\usepackage{marvosym}
\usepackage{MnSymbol,wasysym}
\usepackage{tikz}
\usetikzlibrary{graphs,graphs.standard}
\usepackage{color}
\usepackage{enumerate}
\usepackage{tikz}
\usepackage{mathtools}
\DeclarePairedDelimiter\ceil{\lceil}{\rceil}
\DeclarePairedDelimiter\floor{\lfloor}{\rfloor}
% include this if you want to import graphics files with /includegraphics
\begin{document}
\begin{solution}

Sum all the people and subtract out the double counted people:
$$270+200+50-70 = \boxed{450}$$

\end{solution}
\end{document}