A batsman makes a score of 100 runs in the 17th inning and thus increases his averages by 5. What is his average after 17th inning? Select the correct option
A) 39 B) 35 C) 20 D) 40.5 E) 41.5
let the average after 16th inning =x   then total run after 16th inning=16x   then total run after 17th inning=16x+100   then average run after 17th inning=(16x+100)/17   (16x+100)/17=x+5 = &gt; 16x+100 = 17x+85 =&gt; x =15   x=15;   average after 17th inning =15+5= 
<gadget id="calculator">15+5</gadget>
<output>20</output>
20   ANSWER:20
<result>C</result>
A batsman makes a score of 100 runs in the 17th inning and thus increases his averages by 5. What is his average after 17th inning?