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Start the planThere are \(X\) girls in a class, and their average height is \(M\) inches. In the same class, there are \(Y\) boys with an average height of \(N\) inches. What is the average height of all the students in the class?
A. \(\dfrac{X + Y}{M + N}\)
B. \(\dfrac{M + N}{X + Y}\)
C. \(\dfrac{XM + YN}{M + N}\)
D. \(\dfrac{XM + YN}{X + Y}\)
E. \(\dfrac{MN}{XY}\)
[spoiler]OA=D[/spoiler]
Source: Manhattan GMAT
A. \(\dfrac{X + Y}{M + N}\)
B. \(\dfrac{M + N}{X + Y}\)
C. \(\dfrac{XM + YN}{M + N}\)
D. \(\dfrac{XM + YN}{X + Y}\)
E. \(\dfrac{MN}{XY}\)
[spoiler]OA=D[/spoiler]
Source: Manhattan GMAT
