The average marks obtained by 180 students in an examination is 50. If the average marks of passed students is 80 and that of failed students is 40, then what is the number of students who failed the examination?

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The average marks obtained by 180 students in an examination is 50. If the average marks of passed students is 80 and that of failed students is 40, then what is the number of students who failed the examination?

A90

B135

C100

D45

Answer:

B. 135

Read Explanation:

Total marks obtained = 180 × 50 = 9000 number of failed students be x 40x + (180 - x) × 80 = 9000 x = 135

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