A batsman scored 18 runs in his 18th innings and that makes his average 18. Find his average upto the 17th innings?  Answers:
A) 17  B) 18  C) 19  D) 20  E) 21
total innings=18   avg=18   so total run at 18th innings is   18*18= 
<gadget id="calculator">  18*18</gadget>
<output>324</output>
324   total at 17th inning=324-18= 
<gadget id="calculator">324-18</gadget>
<output>306</output>
306   now  306/17= 
<gadget id="calculator"> 306/17</gadget>
<output>18</output>
18   ANSWER:18
<result>B</result>
A batsman scored 18 runs in his 18th innings and that makes his average 18. Find his average upto the 17th innings?