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For the past \(n\) days, the average (arithmetic mean) daily production at a company was \(50\) units. If today's produc

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For the past \(n\) days, the average (arithmetic mean) daily production at a company was \(50\) units. If today's produc

by Gmat_mission » Thu Jan 07, 2021 10:52 am

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For the past \(n\) days, the average (arithmetic mean) daily production at a company was \(50\) units. If today's production of \(90\) units raises the average to \(55\) units per day, what is the value of \(n?\)

(A) 30
(B) 18
(C) 10
(D) 9
(E) 7

Answer: E

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