NIFT PG 2020 Question Paper with solutions

Let the number of students in classes A,B and C be a,b and c respectively.
(c) Let the number of students in classes A,B and C be a,b and c respectively.
Total score of class B=76b
According to the question,
‌

83a+76b

a+b

=79  [∵ average of A and B=79]
⇒‌‌4a=3b⇒a=‌

3b

4

.....(i)
Again, average of B and C=81
∴ Average of A,B and C=‌

83a+76b+85c

a+b+c

=‌

83× 3b 4 +76b+85× 5b 4

3b 4 +b+‌ 5b 4