Three numbers are in the ratio of 3:5:10 and their LCM is 630. Find their HCF.

If the students of a class can be grouped exactly into 6 or 8 or 10, then the minimum number of students in the class must be. 

Find the L.C.M of $$ {6x}{y^{2}z},{8x^{2}{y^{3}z^{2},{12{x^{3}{y^{3}z^{3}}}}}}$$.

The least multiple of 7, which leaves the remainder 4, when divided by any of 6, 9, 15 and 18, is 

The LCM of three different numbers is 120. Which of the following cannot be their HCF? 

The product of two number is 4107. If the HCF of the number is 37. The greatest number is

Find the total number of Prime Factors of 720 ? 

Three men step off together from the same spot. Their steps measure 63 cm, 70 cm and 77 cm respectively. The minimum distance each should cover so that all can cover the distance in complete steps is