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

(47 × 588) ÷ ( 28 × 120)=?

If $${4x^2={15^2-9^2}}$$ then the value of x is

7 × 7 of 3 ÷ 3 -14 × P=7, then find out the value of P?

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

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

$$ {1\over 8}×(223+?)=71$$

[(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 ?