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Difficulty: 2/102024 NMTC 2024 (QII-60)

The LCM of two numbers is 7200, and their HCF is 180. If one number is 360, then the second number is ________.

Guide / Hint

Hint 1: Use the product formula: .

Hint 2: Substitute the given values: .

Hint 3: Solve for by dividing the product on the right by 360.

Solution

Step 1 (State the Theorem): For any two positive integers and , the product of the two numbers is equal to the product of their Least Common Multiple (LCM) and Greatest Common Divisor / Highest Common Factor (HCF):

Step 2 (Substitute the Values): We are given:

  • One number

Let the second number be . Substituting these values:

Step 3 (Solve for the Second Number b):

Step 4 (Conclusion): The second number is exactly 3600.

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