A batsman in his 12th innings makes a score of 120 and thereby increase his average by 5 The average...........

Quantitative Aptitude (CGL) Average

A batsman in his 12th innings makes a score of 120, and thereby increase his average by 5. The average score after 12th innings is

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Explanation:

Suppose he played I₁, I₂,……, I₁₁ innings and the average is A₁₁.
I₁ + I₂+…+ I₁₁ = 11*A₁₁; ---------eq.(i.)
I₁ + I₂+…+ I₁₁ + 120= 12*(A₁₁ + 5); --------------eq.(ii.)
Subtract eq.(i) from eq.(ii.),
120 = A₁₁ + 60;
A₁₁= 60;
Hence, average after 12 innings = 60 + 5=65.