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If a class, there are 75 students and their average marks in the annual examination is 35. If the average marks of passed students is 55 and average marks of failed students is 30, then find out the number of students who failed. 
  • a)
    15
  • b)
    30
  • c)
    55
  • d)
    60
  • e)
    None of the above
Correct answer is option 'D'. Can you explain this answer?
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If a class, there are 75 students and their average marks in the annua...
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If a class, there are 75 students and their average marks in the annua...
To find the number of students who failed the examination, we need to use the given information about the average marks of the class, the average marks of the passed students, and the average marks of the failed students.

Let's assume the number of students who passed the examination as P and the number of students who failed as F. Therefore, the total number of students in the class can be expressed as:

Total number of students (T) = P + F

Given information:
- Average marks of the class = 35
- Average marks of the passed students = 55
- Average marks of the failed students = 30

We can now write two equations based on the given information:

1. Average marks of the class = (Total marks of all students) / (Total number of students)
35 = (Total marks of all students) / (P + F)

2. Average marks of the class = (Total marks of passed students) / (Number of passed students)
35 = (55 * P) / P

Simplifying equation 2, we get:
35 = 55

This implies that there is an error in the given information or the question itself. The average marks of the class cannot be equal to the average marks of the passed students because the failed students also contribute to the overall average.

Therefore, the correct answer cannot be determined based on the given information.
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Community Answer
If a class, there are 75 students and their average marks in the annua...
75(35-30)/(55-30)=15
required ans
75-15=60
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If a class, there are 75 students and their average marks in the annual examination is 35. If the average marks of passed students is 55 and average marks of failed students is 30, then find out the number of students who failed.a)15b)30c)55d)60e)None of the aboveCorrect answer is option 'D'. Can you explain this answer?
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