What is the L.C.M of 12, 36, 6 and 9?

The greatest common factor of two co-prime numbers will be

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

The LCM of four consecutive numbers is 60 The sum of the first two numbers is equal to the fourth number. What is the sum of four numbers? 

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

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

The LCM of 1.2 and 2.7 is:

The smallest five digit number which is divisible by 12, 18 and 21 is: