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 

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

The LCM of two positive integers is twice the larger number and the HCF of the two numbers is 3. The smaller number is:

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

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