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Question

The mean score of a person is 30 in 'n' exams. If he would have scored six marks extra in each of the first (n-1) exams, his mean score would have been 35. Find the number of exams.


A

3

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B

4

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C

5

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D

6

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Solution

The correct option is D

6


Case - 1: Mean = 30
So, total marks score in "n" exams = 30n.

Case - 2: Mean = 35
So, total marks score in "n" exams = 35n.

Given: he scored 6 marks more in each of the (n-1) exams.
So, 30n + 6(n-1) = 35n
6n-6 = 5n
n = 6.

Or, The number of exams = 6.


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