# SAT Data - Tables

$\begin{array}{|c|c|c|c|c|} \hline & \text{High School} & \text{Middle School} & \text{ Total}\\ \hline \text{Boys} & a & 2b & X\\ \hline \text{Girls} & 2a & b & Y\\ \hline \text{Total} & M & N & T\\ \hline \end{array}$

In the table above, each letter represents the number of students in that category. Which of the following equals $$M-N?$$

(A) $$\ \ X$$

(B) $$\ \ Y$$

(C) $$\ \ 3(Y-X)$$

(D) $$\ \ \frac{T}{3}$$

(E) $$\ \ X+Y$$

×