Find the total number of Prime Factors of 720 ? 

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

A number which when divided by 10 leaves remainder of 9, when divided by 9 leaves a remainder of 8, and when divided by 8 leaves a remainder of 7, is: 

The ratio of two numbers is 2: 3 and their L.C.M is 48.  What is the number?

Which of the following numbers is divisible by 11?

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 

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

Find the LCM of x and (x+3).