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

[(169×121)÷(11×13)]-3=?

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

(47 × 588) ÷ ( 28 × 120)=?

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

Solve the following equation 24 + 4 ÷ 4

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

$$ {1\over 8}×(223+?)=71$$

Direction : What value should come in the place of question mark (?) in the following questions?

80% of 10% of 340 = ?

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: