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Tuba Sarosh

· started a discussion

· 1 Months ago

Issue (Question: 87679.0 )

Why in the question it has been mentioned marks of 100 candidates. Doesnt it mean 100 candidates took exam

Question:
In an exam, the average marks was found to be 50 . After deducting computational error the marks of the 100 candidates had to be changed from 90 to 60 each and the average came down to 45 marks. The total number of candidates who took the exam was: 
Options:
A) 300 
B) 600 
C) 800 
D) 150 
E) None of these
Solution:

Ans:(b) Let the total number of candidates be x.

∴ {50x – 100(90 – 60)}/x = 45 

∴ x = 600

Knowledge Expert

· commented

· 1 Months ago

because out of 600 candidates computational error the marks of the 100 candidates has been changed
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