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Railways PYQCBT 2 2017

RRB NTPC · Question 87

The LCM of two numbers is 40 times its HCF. If the product of the numbers is 1440, find their HCF.

  1. 6

  2. 12

  3. 15

  4. 8

Show answer & explanation

Answer: (A) 6

Explanation

Product = HCF × LCM = HCF × 40·HCF = 40·HCF² = 1440. HCF² = 36, so HCF = 6.