How many two-digit numbers are divisible by 3 but not by 7?

The median of 31, 25, 17, 23, 45 and 59 is:

If ' n ' be any natural number , then by which number ( n⁴-n ) is always divisible ? 

A number when divided by the sum of 555 and 445 gives two times their difference as quotient and 30 as the remainder. The number is: 

Which smallest number should be subtracted from 1000 so that results will be a perfect square? 

The digit in the unit's place of the number represented by (7⁹⁵ - 3⁵⁸) is: 

Which is the largest 3 digit number that is exactly divisible by 15, 25 and 30?

Let x be the least number divisible by 13, such that when x is divided by 4, 5, 6, 7, 8 and 12, the remainder in each case is 2. The sum of the digits of x is: