The average of runs of a cricket player of 10 innings was 30. How many runs must he make in his next innings so as to increase his average of runs by 4?  Choose one
A) 87 B) 74 C) 10 D) 76 E) 17

Rationale: "average after 11 innings = 34 required number of runs = ( 34 * 11 ) - ( 30 * 10 ) = 374 - 300 = 74 . answer : b"
Answer: B