In an examination, a student's average marks were 63. If he had obtained 20 more marks for his Geography and 2 more marks for his history, his average would have been 65. How many subjects were there in the examination?	Options.
A) 12 B) 11 C) 13 D) 14 E) 10
Explanation:   Let the number of subjects = x   Then, total marks he scored for all subjects = 63x   If he had obtained 20 more marks for his Geography and 2 more marks for his history, his average would have been 65   =&gt; Total marks he would have scored for all subjects = 65x   Now we can form the equation as 65x - 63x = additional marks of the student = 20 + 2= 
<gadget id="calculator">20 + 2</gadget>
<output>22</output>
22=&gt; 2x = 22   =&gt; x = 22/2= 
<gadget id="calculator">22/2</gadget>
<output>11</output>
11   Answer: Option 11
<result>B</result>
In an examination, a student's average marks were 63. If he had obtained 20 more marks for his Geography and 2 more marks for his history, his average would have been 65. How many subjects were there in the examination?