What is the sum of first 14 natural numbers?

The difference between the greatest and least five-digit numbers formed by the digits 2,5,0,6,8 is (repetition of digits are not allowed) 

Two numbers are respectively 30% and 40% less than a third number. What percent is the first number of the second?

What will be remainder if (13)³ is subtracted from (66)² ?

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 mean of the first 7 prime numbers is:

Find the least number which when divided by 12, 15, 18 and 27 leaves remainders 10, 13, 16 and 25 respectively.

The sum of three consecutive numbers is 87. The middle number is :