What is the L.C. M of  $$ {2\over 5},{3\over 10},{4\over 15}$$.

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 sum of two and the product of 23 is 120. The sum of the areas will be:

Find the LCM and HCF of 27 and 81.

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

The HCF of two numbers is 24. If sum of the numbers is 480, how many such pairs of numbers are possible?

The LCM of two numbers is 48. If those numbers are in the ratio 2 : 3 then what will be their sum?