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The least number which when divided by 7, 12, 15 and 20 leave zero remainder in each case and when divided by 26 leaves a remainder of 4 is:

Three numbers are in the ratio 6:9:10 respectively. If the HCF of the numbers is 3, then find the LCM of the numbers.

The LCM and the HCF of the numbers 25 and 40 are in the ratio:

LCM of two numbers is 12 times their HCF. The product of the numbers is 25920. What will be the maximum possible difference between the numbers?

The HCF of two numbers is 14. If their product is 5488, then how many such pairs exist?

The LCM of two natural numbers is 15 times their HCF. If the product of given two numbers is 13,500, then find the LCM of the numbers.

Find the difference between sum of digits of LCM and HCF of 28, 42 and 70.

The square of sum of two numbers is 36,864 and the sum of squares of the same two numbers is 21,024. If their H.C.F. is 12, then find their L.C.M. 

What is the HCF of   (x4  - x2  - 6)    and   (x4  - 4x2  + 3) ?