Average score of a class of 50 students, in an exam was 34. Average score of the students who had passed is 52 and the average score of students who had failed is 16. How many failed the exam
Let the number of failed students = x
The number of passed students = 50-x
According to question,
50×34=x×16+52(50-x)
⇒1700=16x+2600-52x
⇒36x=900
⇒x=25
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Directions (next five questions) : What will come in place of question mark (?) in the given number series
8 4 6 15 ? 236.25