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Railways PYQCBT 2 2017

RRB NTPC · Question 23

In a class of 135 students, the number of boys is twice that of girls. One-sixth of the boys and one-third of the girls failed in the final examination. Find the percentage of students who passed the examination.

  1. 75%

  2. 71.45%

  3. 77.78%

  4. 81.23%

Show answer & explanation

Answer: (C) 77.78%

Explanation

Girls = 135/3 = 45 and boys = 90. Failed: 90/6 + 45/3 = 15 + 15 = 30, so 105 passed. 105/135 × 100 = 77.78%.