To find out how many students attend McCord Middle School, we can set up the equation based on the information given. We know that 300 students represent 60% of the total student body.
Let \( x \) be the total number of students at McCord Middle School. We can express this as:
\[ 0.6x = 300 \]
To solve for \( x \), divide both sides by 0.6:
\[ x = \frac{300}{0.6} \]
Calculating the right side:
\[ x = 500 \]
So, the total number of students attending McCord Middle School is \( 500 \) students.
Therefore, the answer is:
500 students