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

On dividing 256a²b²c² by 64a², we get

There are some boys and girls in a room. The square of the number of girls is 28 less than the square of the number of boys. If two more girls join then the number of boys and girls becomes equal, then what is the total number of boys and girls in the room?

The LCM of two positive integers is twice the larger number and the HCF of the two numbers is 3. The smaller number is:

What is the greatest common factor of 2³ × 7² and 2⁵ × 3¹?

Find the HCF of 60, 148 and 382.

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