If (x +y) = 6 and x² + y² = 20 then find the value of (x - y) ².

23+ 3+33+333+3.33=?

Simplify the following equation.
$${(785.785.785+435.435.435) \over(785)^{2}+(435)^{2}-(785)(435)}$$

Direction : What should come in place of the question (?) in the following question.

(41) ² + (38)² × (0.15)²=?

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

How many perfect squares lie between 120 and 300? 

The number, whose square is equal to the difference between the squares of 975 and 585, is: 

If 3x + 7y=75, 5x- 5y= 25, then the value of (x +y)=?