Average score of a class of 50 students in an exam is 34 Average score of the students who have pass...........

Quantitative Aptitude(IBPS RRB PO) Average

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 ?

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Explanation:

Number of failure in the exam = x (let)
∴ Number of successful students = 50 – x
According to the question,
52(50 - x) + 16x = 50 × 34
= 2600 – 52x + 16x = 1700
= 2600 – 36x = 1700
36x = 2600 – 1700 = 900
x = 900/36 = 25