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Railways PYQCBT 1 2016

RRB NTPC · Question 91

There are 3 numbers. The 2^nd number is 3 times the 1^st. the 3^rd is twice the 2^nd. If their average is 70, find the smallest of the 3 numbers. A. 18 B. 19 C. 20 D. 21

  1. B

  2. A

  3. D

  4. C

Show answer & explanation

Answer: (C) D

Explanation

Let the first number be x; then the others are 3x and 6x. Their sum 10x = 3 × 70 = 210, so x = 21, the smallest.