To find the total number of students at McCord Middle School, we can set up an equation based on the information provided.
We know that 200 students who rode their bike or walked to school represent 40% of the total student body. Let \( x \) be the total number of students.
According to the information given: \[ 0.40x = 200 \]
To solve for \( x \), divide both sides by 0.40: \[ x = \frac{200}{0.40} \] \[ x = 500 \]
Thus, the total number of students at McCord Middle School is 500 students.