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A batsman makes a score of 84 runs in the 21st inning and thus increases his average by 2 runs. His average after 21st inning is-
Answer & Solution
Correct Answer:
Option
C
Let the average for 20 innings be x
$$\eqalign{ & \therefore \frac{{20x + 84}}{{21}} = x + 2 \cr & \Rightarrow 20x + 84 = 21x + 42 \cr & \Rightarrow x = 42 \cr} $$
∴ Average after 21st innings
= 42 + 2
= 44
$$\eqalign{ & \therefore \frac{{20x + 84}}{{21}} = x + 2 \cr & \Rightarrow 20x + 84 = 21x + 42 \cr & \Rightarrow x = 42 \cr} $$
∴ Average after 21st innings
= 42 + 2
= 44
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