51. Three wheels can complete 40, 24 and 16 revolutions per minutes respectively. There is a red spot on each wheel that touches the ground at time zero. After how much time, all these spots will simultaneously touch the ground again ?
52. Find the HCF of 132, 204 and 228 = ?
53. The LCM of four consecutive numbers is 60. The sum of the first two numbers is equal to the fourth number. What is the sum of four numbers
54. If the product of three consecutive numbers is 210, then the sum of the smaller numbers is = ?
55. If three number are 2a, 5a and 7a, what will be their LCM ?
56. The product of two whole numbers is 1500 and their HCF is 10. Find the LCM = ?
57. A number x is divided by 7. When this number is divided by 8, 12 and 16. It leaves a remainder 3 in each case. The least value of x is = ?
58. Two pipes of length 1.5 m and 1.2 m are to be cut into equal pieces without leaving any extra length of pipes. The greatest length of the pipe pieces of same size which can be cut from these two lengths will be = ?
59. A general of an Army wants to create a formation of square from 36562 army men. After arrangement, he found some army men remainder unused.
60. The number of pair of positive integers whose sum is 99 and HCF is 9 is =
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