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Two numbers multiply to 1800 and their HCF is 15. What is their LCM?

Competition practiceNumber System, HCF & LCM
  • A120
  • B90
  • C180
  • D27000

Step-by-Step Solution

HCF × LCM = product of the two numbers, so LCM = 1800 ÷ 15 = 120. (The pair 15 and 120 fits: HCF 15, LCM 120. 27000 comes from multiplying instead of dividing.)
Answer: A) 120

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