Which of the following actions is permitted to the

The HCF of two numbers is 84, and their LCM is 2520. What is the sum of the numbers?

The HCF of 450 and 740 is 150, their LCM is:

The LCM of two numbers is 5 times of their HCF. The sum of LCM and HCF is 300. If one of the number is 250, then the other number is:

If total number of factors of 5,292 is 'x', then find the value of (x - 7)(x + 2).

If HCF of two numbers is 11 then which of the following can never be their LCM?

Sum of the two numbers is 80. LCM and HCF of that two number is 168 and 8 respectively. Find the difference of the numbers?

The least number which is exactly divisible by 15, 25 and 30 is 

Find the largest number of the five digit which is exactly divisible by 48, 72 and 108.

Find the greatest number that will divide 420, 525 and 300 without leaving a remainder.