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A batsman has a certain average runs for 11 innings . In the 12th innings he made a score of 90 runs and thereby decrease his average by 5 . His average after 12th innings is?

127
145
150
217

Correct Answer: 145

Explanation:

Let the average for first 11 innings is y
From question
11y + 90 = (y - 5) x 12
⇒ y = 150
∴ Average after 12th inning = (150 - 5)= 145

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