Question

The average marks of 250 students in a class is 50. If the average of passed candidates is 55 and that of the failed candidates is 30. Find the number of failed students

Answer 1

Answer:

23

Step-by-step explanation:

really I don't know the correct answer

Answer 2

Given,

A class of 250 students has an average mark of 50.

The mark of passed students is 55.

The mark of failed students is 30.

To Find,

Students who failed.

Solution,

The total marks of 250 students = $(250)(50) = 12500$

Let us say $x$ be the number of students who have passed,

⇒ The number of students who failed = $250 - x$ = $y$

Thus $(x)(55) + (30)(y) = (x)(55) + (250-x)(30) = 12500$

⇒ $25x = 5000$

⇒ $x = 200$

Thus $y = 50$

Henceforth, the number of students who have failed is 50.