A man whose bowling average is 22.2, takes 4 wickets for 36 runs and thereby decreases his average by 1.2. The number of wickets, taken by him before his last match is :	Choose the most appropriate option:
A) 14
B) 22
C) 38
D) 40
E) 50
Explanation :   Let the number of wickets taken before the last match is x.   Then, (22.2x + 36)/(x + 4) = 21   =&gt; 22.2x+36 = 21x+84   =&gt; 1.2x = 48   =&gt; x = 48 / 1.2= 
<gadget id="calculator">48 / 1.2</gadget>
<output>40</output>
40   Answer : 40
<result>D</result>
A man whose bowling average is 22.2, takes 4 wickets for 36 runs and thereby decreases his average by 1.2. The number of wickets, taken by him before his last match is :