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SSC :: SSC CHSL Quantitative Aptitude

SSC CHSL » Quantitative Aptitude » General Questions - Discussion

1 .


In an examination, a student's average marks were 63. If he had obtained 20 more marks in Geography and 2 more marks in history, then his average would have been 65. How many subjects were there in the examination?

[ A ]    12
[ B ]    11 right
[ C ]    13
[ D ]    14
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

= additional marks of the student

= 20 + 2 = 22

2x= 22

x = $22 \over 2$ = 11
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