A batsman makes a score of 87 runs in the 17th inning and thus increases his average by 4. Find his average after 17th inning.	Choose the correct choice from the following options
A) 36	B) 39	C) 23	D) 45	E) None of the above
Let the average after 17th inning = x.   Then, average after 16th inning = (x – 4).   ∴ 16(x – 4) + 87 = 17x or x = (87 – 64) = 23.   Answer 23
<result>C</result>
A batsman makes a score of 87 runs in the 17th inning and thus increases his average by 4. Find his average after 17th inning.