1.

1). 1502). 3503). 6004). 700

Answer»

Let the TOTAL number of students appeared be n

And let the sum of MARKS of total STUDENT be S

∴ average marks = S/n = 50

⇒ S = 50n...........Equation. (1)

Now, after deducting 30 marks as the score is REDUCED from 90 to 60 of 100 students, the new sum of marks = S - 3000

∴ new average = (S - 3000)/n

But new average = 45

So, (S - 3000)/n = 45

Now, from equation. (1), we know that S = 50n

⇒ 50n - 3000 = 45n

⇒ n = 3000/5 = 600

∴ total number of students who appeared for an exam = 600



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