Question

Rahul has scored 78, 72, 90 and 82 marks respectively in his English, Hindi, Maths and Science papers.

What are his marks in Social Studies, if his average score in all the 5 papers is 80?
A 78 B 79.5
C 80 D 80.5

Answer 1

Hello Friend,

Here,

Marks in English = 78
Marks in Hindi = 72
Marks in Maths = 90
Marks in Science = 82

Let Marks obtained in Social Studies be x.

Average = 80 marks
So, (Total marks)/Number of subjects = 80

So, (78+72+90+82+x)/5 = 80
So, (322+x) = 80×5
So, 322 + x = 400
So, x = 400-322
So, x = 78

Thus, marks obtained in Social Studies is 78. (Option A)


Hope it helps.

Purva
@Purvaparmar1405
Brainly.in

Answer 2

The correct answer is option (A) - 78.

Step-by-step solution:-
Let Marks obtained in Social Studies be x.

As we know that marks obtained in :-
English = 78
Hindi = 72
Maths = 90
Science = 82
Social studies = x
Total marks = 322 + x

And average score = 80
Hence, Total marks/Number of subjects = 80

=> (322+x) = 80×5
=> 322 + x = 400
=> x = 400-322
=> x = 78