NextMockSearch exams, e.g. SSC CGL, UPPSC, Lekhpal
Railways PYQCBT 1 2016

RRB NTPC · Question 40

The average of first three out of four numbers is 18. The average of the last three numbers is 14. The sum of the first and last number is 16. The last number is

  1. 17
  2. 13
  3. 9
  4. 2
Show answer & explanation

Answer: (D) 2

Explanation

a + b + c = 54 and b + c + d = 42, so a − d = 12. With a + d = 16, 2d = 4, so d = 2.