Discussion

Explanation:

Let the batting average for first 20 innings be a.

Total runs scored in first 20 innings = 20 × a.

∴ Total score after 21 innings = 20a + 135

⇒ Average after 21 innings = a + 2 = (20a + 135)/21

⇒ 21a + 42 = 20a + 135

⇒ a = 93

Alternately,
Since the average of now 21 innings increases by 2 runs hence he scored 21 × 2 = 42 runs more than old average.

∴ 135 - a = 42

⇒ a = 93

Hence, 93.

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