HCF and LCM – Railway Maths Part Ⅵ

Total Questions: 50

31. The LCM of two numbers is 126 and their HCF is 2. If one number is 18 then the other is: [RRB NTPC 07/03/2021 (Evening)]

Correct Answer: (a) 14

32. The least square number that is exactly divisible by 4, 5, 8, 16 and 32 is: [RRB NTPC 07/03/2021 (Evening)]

Correct Answer: (a) 1600

33. The least number that when divided by 9, 16, 20 or 24, leaves 3 as remainder in each case is: [RRB NTPC 07/03/2021 (Evening)]

Correct Answer: (c) 723

34. Find the least number that on being divided by 5, 6, 8, 9 and 12 leaves 4 as the remainder in each case. [RRB NTPC 08/03/2021 (Morning)]

Correct Answer: (a) 364

35. The sum of the digits of the smallest number which, when divided by 18, 21, 25 and 39 leaves a remainder of 3 in each case is: [RRB NTPC 08/03/2021 (Evening)]

Correct Answer: (a) 21

36. The product of the LCM and HCF of two positive numbers is 28 and their difference is 3. The numbers are: [RRB NTPC 08/03/2021 (Evening)]

Correct Answer: (c) 4 and 7

37. Calculate the LCM of 22, 34 and 40. [RRB NTPC 11/03/2021 (Morning)]

Correct Answer: (c) 7480

38. Calculate the HCF of [RRB NTPC 11/03/2021 (Morning)]

Correct Answer: (d) 2/81

39. Find the least number which is required to be added to 2495 so that the sum is exactly divisible by 3, 4, 5 and 6. [RRB NTPC 11/03/2021 (Morning)]

Correct Answer: (c) 25

40. Find the greatest number of five digits that is divisible by 15, 21 and 35. [RRB NTPC 12/03/2021 (Morning)]

Correct Answer: (d) 99960