\documentclass[12pt]{article}
\usepackage{amssymb,amsmath,amscd,concmath}
\pagestyle{empty}
\begin{document}
\begin{equation*}
\text{score} = \frac{\sum_{i=1}^4 \text{HW}_i}{130} \cdot 25 + \frac{\text{MT}}{50} \cdot 20
\end{equation*}
\end{document}