LIC AAO Model Paper 10

Question : 33 of 160

Marks: +1, -0

Average score of a class of 50 students, in an exam is 34. Average score of the students who have passed is 52 and the average score of students who have failed is 16. How many students have failed in the exam ?

Validate

Solution:

Number of failures in the exam = x (let)
∴ Number of successful students = 50 - x
According to the question,
52(50 - x) + 16x = 50x34
⇒ 2600- 52x + 16x= 1700
⇒ 2600 - 36x = 1700 ⇒ 36x= 2600- 1700 = 900
⇒ x =

{900}/{36}

= 25

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