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. 

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

If the least common multiple(LCM) of two numbers is 231, the Highest common multiple(H.C.F)  of both numbers is 11 and the first number is 77, then the second number is

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

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

Three Alarm make a beep after every 48 sec, 72 sec and 108 sec respectively. They beeped together at 10 a.m. The time when they will next make a beep together at the earliest is

The product of two numbers is 2028 and their HCF is 13. The number of such pair is-

If (x + k ) is the common factor of x² + ax + b and x² + cx + d , then what is k equal to ?