51. The least perfect square which is divisible by each of 21, 36 and 66 is = ?
52. The H.C.F. of $$\frac{a}{b}{\text{,}}\frac{c}{d}{\text{,}}\frac{e}{f}$$ is equal to = ?
53. The HCF of $$\frac{9}{{10}}{\text{,}}\frac{{12}}{{25}}{\text{,}}\frac{{18}}{{35}}$$ and $$\frac{{21}}{{40}}$$ is = ?
54. The LCM of $$\frac{2}{3}{\text{,}}\frac{3}{5}{\text{,}}\frac{4}{7},\frac{9}{{13}}$$ is = ?
55. Let the least number of six digits which when divided by 4, 6, 10, 15 leaves in each case same remainder 2 be N. The sum of digits in N is = ?
56. The smallest square number divisible by 10, 16 and 24 is ?
57. The G.C.D. (greatest common divisor) of 1.08, 0.36, 0.9 is = ?
58. HCF of 3240, 3600, and a third number is 36 and their LCM is 24 × 35 × 52 × 72 . The third number is = ?
59. From a point on a circular track 5km long A,B and C started running in the same direction at the same time with speed of $$2\frac{1}{2}$$ km per hour, 3 km per hour and 2 km per hour respectively. Then on the starting point all three will meet again after ?
60. Three numbers which are co-prime to one another are such that product of the first two is 551 and that of the last two is 1073. The sum of the three numbers is = ?
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