The LCM of two numbers is 420 and their HCF is 6. If one number is 84, what is the other number?

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• A 30
• B 35
• C 40
• D 50

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Answer: A. 30

Product of two numbers = HCF x LCM = 6 x 420 = 2520.
Other number = 2520 / 84 = 30.

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