What should be added to the product 201x105 to get 21171?

Find the smallest number which when increased by 20 is completely divisible by 12, 20, 15, 18 and 24.

The LCM of the numbers 3.7 and 0.068 is:

The number of prime numbers lying between 323 and 332 is:

The number of prime numbers lying between 300 and 305 is:

Find the Highest Common Factor (HCF) of 372, 732 and 2196.

What is the year before 2001 whose calendar is the same as 2001?