Question

Average marks of 210 students who appeared in an exam are 45. Average marks of failed students are 27 while the average marks of passed students are 54. Number of passed students is.

• A. 120
• B. 140
• C. 180
• D. 100

Answer 1

Answer:

B. 140

Let number of failed students be x Number of passed students = 210 – x x × 27 + (210 – x) × 54 = 210 × 45 ⇒ 27x + 11340 – 54x = 9450 ⇒ 54x – 27x = 11340 – 9450 ⇒ 27x = 1890 ⇒ x = 1890/27 ⇒ x = 70 Number of passed students = 210 - 70 = 140