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

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? 

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

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

On dividing 256a²b²c² by 64a², we get

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

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

The number between 4000 and 5000 that is divisible by each of 12, 18, 21 and 32 is