In an examination, a

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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

Answer: Option B

Answer : Option B

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
=> Total marks he would have scored for all subjects = 65x
Now we can form the equation as 65x - 63x = the additional marks of the student = 20 + 2 = 22
=> 2x = 22
$MF#%=> x = \dfrac{22}{2} = 11$MF#%

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