What number should be divided by $\sqrt{0.25}$ to give the result as $25$?

$A$ General wishing to draw up his $5180$ men in the form of a solid square found that he had $4$ men less. If he could get four more men and form the solid square,the number of men in the front row is

For what value of $x$ is the statement $\left(\frac{x}{15}\right)\left(\frac{x}{135}\right)=1$ true?

$\left(\sqrt{3}-\frac{1}{\sqrt{3}}\right)^{2}$ simplifies to

$\sqrt{6354} \times 34.993 = ?$

The smallest number which is a perfect square and contains $7936$ as a factor is