Question

The HCF of two numbers is 6 and their LCM is 84. If one of these numbers is 42, then the second number is:

A 12 Correct Answer Incorrect Answer
B 40 Correct Answer Incorrect Answer
C 48 Correct Answer Incorrect Answer
D 30 Correct Answer Incorrect Answer

Solution

Product of two numbers = HCF × LCM First number× Second number= 6 × 84 ⇒ 42 × Second number= 6 × 84 ⇒ Second number= (6 × 84)/42 = 12 ∴ The second number= 12

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