Question

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?

• A. 90
• B. 135
• C. 100
• D. 45

Answer 1

Answer:

B. 135

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