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Add up all the natural numbers n for which LCM(n, 12) = 60. What is the total?

Competition practiceNumber System, HCF & LCM
  • A140
  • B135
  • C80
  • D60

Step-by-Step Solution

Since must divide 60 and contain the factor 5: with dividing 12. So , 10, 15, 20, 30, 60, which add to 140.
Answer: A) 140

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