A batsman in his 11th inning makes a score of 69 and their by increasing his average by 1. What is his average after the 11th inning?  Options:
A) 58
B) 59
C) 68
D) 69
E) 78

Rationale: "10 x + 69 = 11 ( x + 1 ) x = 58 + 1 = 59 answer : b"
Answer: B