A batsman makes a score of 87 runs in the 17th inning and thus increases his average by 3. Find his average after 17th inning?

40
39
50
55

Correct Answer: 39

Explanation:

Let the average after 17th innings = x
Then average after 16th innings = (x - 3)
Therefore 16 × (x - 3) + 87 = 17x
Therefore x = 39

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