If the 8 digit number 789x531y is divisible by 72, then the value of (5x - 3y) will be?

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

The product of 2 numbers is 1575 and their quotient is 9/7. Then the sum of the numbers is –

Which of the following fraction is the smallest?

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In a two-digit number, its units digit exceeds its tens digit by 2 and that the product of the given number and the sum of its digits is equal to 460. The number is:

The sum of the squares of two natural consecutive odd numbers is 394. The sum of the numbers is –

Twenty-one time of a positive number is less than its square by 100. The value of the positive number is

1! + 2! + 3! + 4! + ......... + 50! Find the unit digit of?