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Quantitative Aptitude

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Percentage & Averages

Question
28 out of 30
 

In an exam, the average was found to be 50 marks. After detecting computer errors, the marks of 100 candidates had to be changed from 90 to 60 each and the average came down to 45.The total number of candidates who took the exam was



A 600
B 700
C 500
D 400
E None of These

Ans. A Changing = 100 x 30 = 3000

Let the candidate = x

X x 50 – 3000 = X x 45

5x = 3000

X = 600

Percentage & Averages Flashcard List

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