a and b are two whole numbers and c is their HCF, then the LCM of those two numbers is

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

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

The least number which when divided by 4, 6, 8 and 9 leave zero remainders in each case and when divided by 13 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?

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

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