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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}BoysGirlsTotalHigh Schoola2aMMiddle School2bbN TotalXYT
In the table above, each letter represents the number of students in that category. Which of the following equals M−N?M-N?M−N?
(A) X\ \ X X
(B) Y\ \ Y Y
(C) 3(Y−X)\ \ 3(Y-X) 3(Y−X)
(D) T3\ \ \frac{T}{3} 3T
(E) X+Y\ \ X+Y X+Y
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