Two numbers are in the ratio 3 : 5 and their HCF is 20. Their LCM is

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. 

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

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

The least number, which is a perfect square and is divisible by each of the numbers 16, 20 and 24 is 

The sum of the HCF and LCM of two numbers is 680 and the LCM is 84 times the HCF. If one of the numbers is 56, the other is : 

Three numbers which are co-prime to one another are such that the product of the first two is 551 and that of the last two is 1073. The sum of the three numbers is: 

Two numbers are in the ratio 3 : 4. Their LCM is 84 . The greater number is: