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SAT Data - Tables

High SchoolMiddle School TotalBoysa2bXGirls2abYTotalMNT\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 MN?M-N?

(A)   X\ \ X

(B)   Y\ \ Y

(C)   3(YX)\ \ 3(Y-X)

(D)   T3\ \ \frac{T}{3}

(E)   X+Y\ \ X+Y


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