1. 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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  • By: anil on 05 May 2019 01.37 am
    Let the number of students who failed = $$x$$ => Number of students who passed = $$(50 - x)$$
    Acc. to ques, => $$frac{(52 imes (50 - x)) + (16 imes x)}{50} = 34$$ => $$52 imes 50 - 52x + 16x = 34 imes 50$$ => $$52x - 16x = 50 imes (52 - 34)$$ => $$36x = 50 imes 18$$ => $$x = frac{50 imes 18}{36} = 25$$
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