Find the average of the cubes of the first five natural numbers. 

The sum of four numbers is 64. If you add 3 to the first number, 3 is subtracted from second number, the third is multiplied by 3 and the sum is divided by 3, then all the results are equal. What is the difference between the largest and the smallest of the original numbers?

Natu and Buchku each have certain number of oranges. Natu says to Buchku, “If you give me 10 of your oranges, I will have twice the number of oranges left with you”. Buchku replies,“If you give me 10 of your oranges, I will have the same number of oranges as left with you”. What is the number of oranges with Natu and Buchku, respectively?

The sum of three numbers is 252. If the first number is thrice the second and third number is two-third of the first, then the second number is

A number when divided by 6 leaves remainder 3. When the square of the same number is divided by 6, the remainder is : 

For which value of x the seven-digit number 8439x53 is divisible by 99?

The digit in unit’s place of the product 81 × 82 × 83 × ... × 89 is

Which of the following numbers is not a prime number?