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Question

Find the smallest number divisible by 5, 10 and 15.

This question was previously asked in
RRB Technician 2026 Grade 3 Question Paper (7-Oct-2026) (Shift 3)
The correct answer is

30

The smallest number divisible by 5, 10 and 15 is their LCM.

Prime factors: 5 = 5, 10 = 2 × 5, 15 = 3 × 5.

LCM = 2 × 3 × 5 = 30.

Hence, the answer is 30.

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Similar Questions

  1. The HCF and LCM of two numbers are 14 and 420, respectively. If one of the numbers is 84, find the other number.

  2. The LCM of the numbers 5, 15.5 and 0.83 is:

  3. There are 48 students in section A and 52 students in section B of a class in a school. What is the minimum number of books required for their class library so that they can distribute equally among the students of section A or section B?

  4. Find the greatest number that exactly divides 294, 210, and 378.

  5. If the ratio of two numbers is 4 : 1, and their HCF is 47, then their LCM is:

  6. A is a prime number. It is given that LCM (A, 30) = 210. What is the value of A?


Important Questions from LCM and HCF

  1. The HCF and LCM of two numbers are 12 and 72, respectively. If the ratio of the two numbers is 2 ∶ 3, then the larger of the two numbers is:

  2. Find the greatest number that will divide 43, 91 and 183 so as to leave the same remainder in each case.

  3. Joseph visits the club on every 5 th day, Harsh visits on every 24 th day, while Sumit visits on every 9 th day. If all three of them met at the club on a Sunday, then on which day will all three of them meet again?

  4. What is the least number which when divided by 12,20 and 24 leaves in each case a remainder of 8?

  5. Which of the following is a pair of co-primes?

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