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After scoring 85 runs in the 17th innings, a batsman's average run increases by 3. What was his average before the 17th?

After scoring 85 runs in the 17th innings, a batsman's average run increases by 3. What was his average before the 17th? Correct Answer 34 runs

Let the initial average be A. ATQ,  16 x A + 85 = 17 x (A + 3) or,  16A + 85 = 17A + 51 or, 17A - 16A = 85 - 51 or,  A =  34 runs

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