The HCF and the LCM of two numbers are 5 and 120, respectively. If the sum of the two numbers is 55, then the sum of the reciprocals of these two numbers is equal to:

If the LCM of two numbers is 288 and their ratio is 4 : 9, then HCF of the numbers is : 

Find the LCM and HCF of 27 and 81.

The HCF of two numbers is 21 and their LCM is 840. If one of the numbers is 49, then the other number is:

Two pipes of length 1.5 m and 1.2 m are to be cut into equal pieces without leaving any extra length of pipes. The greatest length of the pipe pieces of same size which can be cut from these two lengths will be

By what least number should 21600 be multiplied to make it a perfect square?

The LCM of 1.2 and 2.7 is:

A number between 1000 and 2000 which when divided by 30, 36 and 80 gives a remainder 11 in each case is: