A batsman makes a score of 120 runs in the 10th inning and thus increases his average by 10 Find his...........

Quantitative Aptitude (CDS) Average

A batsman makes a score of 120 runs in the 10th inning and thus increases his average by 10. Find his average after 10 innings?

Let the average after 10th inning = x
Then, average after 9th inning = (x-10)
9(x-10)+120 = 10x
x = 30

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