The mean of the first 7 prime numbers is:

The sum of two digit number is 16. If the digit is interchanged the number is formed 18 less than the original number. Find the original number.

The least number that should be added to 2,397 so that the sum is exactly divisible by 3, 4, 5 and 6 ?

The largest three-digit number that gives the same remainder 2 when divided by 3, 5 and 9 is ________.

The least number that must be added to 8961 to make it exactly divisible by 84 is 

Find the greatest number which divides 108, 124 and 156, leaving the same remainder. 

Two numbers are such that their difference, their sum and their product is in the ratio of 1: 7: 24. The product of numbers is

A number when divided by 5 leaves a remainder 3. What is the remainder when the square of the same number is divided by 5 ?