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

This question was previously asked in
NTPC CBT 2 2016 Previous Paper 5 (Held On: 18 Jan 2017 Shift 2)
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  1. 6
  2. 12
  3. 15
  4. 8

Answer (Detailed Solution Below)

Option 1 : 6
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Detailed Solution

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Given:

LCM = 40 times HCF

The product of the numbers is 1440

Formula used:

LCM × HCF = Product of numbers

Calculation:

Let HCF of the number be 'H'

⇒ LCM = 40H

Now,

LCM × HCF = Product of numbers

⇒ 40H × H = 1440

⇒ H2 = 1440/40 = 36

⇒ H = 6

∴ HCF = 6

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