To find the total student body at McCord Middle School, we need to use the information that 300 students represent 60% of the total students.
Let \( x \) be the total number of students. We can set up the equation based on the percentage:
\[ 0.6x = 300 \]
To solve for \( x \), divide both sides by 0.6:
\[ x = \frac{300}{0.6} \]
Calculating the right side:
\[ x = 500 \]
Thus, the total number of students attending McCord Middle School is 500 students.