In an examination, the average marks were 60. On catching an error, it was found that the marks of 80 students had changed from 90 marks to 60 marks per student. The average also reduced to 50 marks. Find how many students took the exam?

In an examination, the average marks were 60. On catching an error, it

1.	In an examination, the average marks were 60. On catching an error, it was found that the marks of 80 students had changed from 90 marks to 60 marks per student. The average also reduced to 50 marks. Find how many students took the exam?
A.	250
B.	240
C.	300
D.	280
Answer» C. 300

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In an examination, the average marks were 60. On catching an error, it was found that the marks of 80 students had changed from 90 marks to 60 marks per student. The average also reduced to 50 marks. Find how many students took the exam?

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