The smallest positive integer when multiplied by 392, the product is a perfect square, is 

Direction: what should come in place at question mark(?).

The sum of the squares of two positive integers is 100 and the difference of their squares is 28. The sum of the numbers is: 

[(169×121)÷(11×13)]-3=?

Solve the following equation 24 + 4 ÷ 4

If 2x + 3y - 5z = 18 , 3x + 2y + z = 29 and x + y + 3z = 17 , then what is the value of xy + yz + zx ? 

Simplify :

The smallest positive integer n for which 864 x n is a perfect cube, is: