📢 Too many exams? Don’t know which one suits you best? Book Your Free Expert 👉 call Now!

  • google app store apple app store
  • ✖

      Question

      Find the greatest 4-digit number which is exactly

      divisible by 12, 15 and 18.
      A 8900 Correct Answer Incorrect Answer
      B 9970 Correct Answer Incorrect Answer
      C 9600 Correct Answer Incorrect Answer
      D 7900 Correct Answer Incorrect Answer

      Solution

      12 = 2² × 3 15 = 3 × 5 18 = 2 × 3² LCM = 2² × 3² × 5 = 4 × 9 × 5 = 180 Greatest 4-digit number = 9999 Greatest multiple of 180 ≤ 9999: 9999 ÷ 180 ≈ 55.55…, so take 55 Required number = 55 × 180 = 9900

      Practice Next

      Relevant for Exams:

      ask-question