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Railways PYQCBT 1 2016

RRB NTPC · Question 98

Three numbers are in the ratio of 3 : 5 : 10 and their LCM is 630. Find their HCF. A. 21 B. 42 C. 63 D. 36

  1. A

  2. D

  3. C

  4. B

Show answer & explanation

Answer: (A) A

Explanation

Let the numbers be 3k, 5k and 10k, whose LCM is 30k = 630, so k = 21. The numbers are 63, 105 and 210, and their HCF = 21.