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

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

(41) ² + (38)² × (0.15)²=?

There are some boys and girls in a room. The square of the number of the girls is less than the square of the number of boys by 28. If there were two more girls, the number of boys would have been the same as that of the girls. The total number of the boys and girls in the room are

Simplify : $$ {9\over 13} ÷{18\over 26}÷{90\over 52}$$

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

Find the value of given expression.

3 – (– 6) {– 2 – 9 – 3} ÷ 7{1 + (– 2) (– 1)}

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

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

$$ {1\over 8}×(223+?)=71$$