Question:A cricketer has a certain average for `9` innings. In the tenth inning, he scores `100` runs ,thereby increasing his average by `8` runs. His new average is : 

A `20 runs` 
B `24 runs` 
C `28 runs` 
D `32 runs` 

+ Answer
C 

+ Explanation
Let average for `9` innings be x. Then,

`(9x + 100)/10`

`= x + 8 ⇒ 10x + 80`

`= 9x + 100 ⇒ x = 20`.

:. New average 

`= (x + 8)`

`= 28 runs`.

+ Report

Irin Moni

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