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

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

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Let the average after 17th inning = x. 

Then, average after 16th inning = (x - 3). 

∴ 16 (x - 3) + 87 = 17x or x = (87 - 48) = 39.

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