A batsman in his 18th innings makes a score of 150 runs and there by increasing his Average by 6.
Find his average after 18th innings.  Select:  A) 150  B) 18  C) 6  D) 17  E) 42
Let the average for 17 innings is x runs   Total runs in 17 innings = 17x   Total runs in 18 innings = 17x + 150   Average of 18 innings = 17x + 150/18   : . 17x + 150/18 = x + 6 -- &gt; x = 42   Thus, average after 18 innings = 42   Answer is 42.
<result>E</result>
A batsman in his 18th innings makes a score of 150 runs and there by increasing his Average by 6.
Find his average after 18th innings.