In a class of 50 students, 10 have failed and their average marks are 28 . The total marks obtained by the entire class are 2800 . The average marks of those who have passed are

Question

In a class of 50 students, 10 have failed and their average marks are 28 . The total maraks obtained by the entire class are 2800 . The average marks of those who have passed are

(a) 43

(b) 53

(c) 63

(d) 70

Answer 1

Total marks of 10 failed students $=28 \times 10 =280$

Total marks of 50 students $=2800$

$\therefore$ Total of 40 passed students $=2800-280 =2520$

$\therefore$ Average marks of 40 passed students $=\frac{2520}{40}=63$

So, The correct option of this question will be (C).