In a two - digit number, the digit at the unit's place is 1 less than twice the digit at the ten's place. If the digits at units and ten's place are interchanged, the difference between the new and the original number is less than the original number by 20. The original number is: 

The east positive integer that should be subtracted from 3011 x 3012 so that the difference is a perfect square is-

Which of the following is the largest fraction    

If 738 A6A is divisible by 11, then the value of A is-

Find the difference between mean and median in the given data 2.5, 4.6, 7.2, 3.3, 4.9, 5.6, 2.7?

On adding a natural number P to the product of four consecutive natural numbers we get a perfect square number. The minimum value of P is:

If the sum of a number and its reciprocal be 2, then the number is-

The value of (81)3.6 * (9)2.7/ (81)4.2 * (3) is __