61. The ratio of two numbers is 3 : 4 and their LCM is 120. The sum of numbers is = ?
62. The greatest 4 digit number which is exactly divisible by each one of the numbers 12, 18, 21 and 28 = ?
63. The traffic lights at three different signal points change after every 45 seconds, 75 seconds and 90 seconds respectively. If all change simultaneously at 7:20:15 hours, then they will change again simultaneously at = ?
64. LCM of two prime numbers x and y (x > y) is 161. Then the value of 3y - x is = ?
65. The LCM of two prime numbers x and y (x > y) is 161. The value of (3y - x):
66. The sides of a triangular field are 62 m, 186 m and 279 m. Find the greatest length of tape that would be able to exactly measure each of them without any fractions.
67. What is the HCF of the polynomials (x4 - 1), (x3 - 3x2 + 3x - 1) and (x3 - 2x2 + x)?
68. The least perfect square, which is divisible by each of 21, 36 and 66 is:
69. A and B run a 12 km race on a circular track of length 1200 m. They complete one round in 300 seconds and 400 seconds, respectively. After how much time from start will the faster person meet the slower person for the last time?
70. The sum of two positive numbers is 240 and their HCF is 15. Find the number of pairs of numbers satisfying the given condition.
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