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In a college class, each student’s overall grade is calculated by averaging the student’s grades on \(t\) different exam

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In a college class, each student’s overall grade is calculated by averaging the student’s grades on \(t\) different exam

by M7MBA » Sun Jun 21, 2020 1:51 pm

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In a college class, each student’s overall grade is calculated by averaging the student’s grades on \(t\) different exams. Up until the last exam, Wei had earned an average exam grade of \(0.75g.\) After earning a grade of \(g\) on the last exam, Wei’s overall grade in the class was \(0.8g.\) What is the value of \(t ?\)

(A) 2
(B) 3
(C) 4
(D) 5
(E) 6

[spoiler]OA=D[/spoiler]

Source: Manhattan GMAT
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