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The average (arithmetic mean) of 9 scores is \(N.\) If a 10th score is then included with the original 9, the average of the 10 scores is \(T.\) Which of the following expressions represents the value of the 10th score?
(A) \(10(T−N)\)
(B) \(10T−9N\)
(C) \(\dfrac{10T−9N}{10}\)
(D) \(\dfrac{10T−9N}{9}\)
(E) \(\dfrac{10T−9N}{2}\)
[spoiler]OA=B[/spoiler]
Source: GMAT Paper Tests
(A) \(10(T−N)\)
(B) \(10T−9N\)
(C) \(\dfrac{10T−9N}{10}\)
(D) \(\dfrac{10T−9N}{9}\)
(E) \(\dfrac{10T−9N}{2}\)
[spoiler]OA=B[/spoiler]
Source: GMAT Paper Tests
