Numbers Questions

What least number must be subtracted from 518, so that the sum is completely divisible by 13?

The 2nd and 8th term of an arithmetic progression are 17 and -1 respectively. What is the 14th term?

If the Arithmetic mean of 7, 5, 13, x and 9 is 10, then the value of x is

30% of a number exceeds 25% of the same number by 27. What is the value of the number?

What will be the next set of numbers in the series? (2,3), (3,5), (5,7), (7,11), (11,13), ___

How many numbers divisible by 125 can be written by using all the digits 2,3,8,7,5 exactly once?

What is the least number that when divided by 63 and 105 leaves remainder 4 in each case?

For what value of X, 211X will be a perfect square?