The decimal expansion of $\frac{337}{125}$ is $\ldots \ldots \ldots \ldots$

$\frac{47}{500}$ has $\ldots$ digits after the decimal point in its terminating decimal expansion.

If $n$ is an odd integer,then show that $n^{2}-1$ is divisible by $8$.

Simplify: $\frac{2}{\sqrt{5}-\sqrt{3}} + \frac{4}{\sqrt{10+\sqrt{84}}} - \frac{2}{\sqrt{7}-\sqrt{5}}$

The values of the remainder $r$,when a positive integer $a$ is divided by $3$ are $0$ and $1$ only. Justify your answer.

$A$ sweet seller has $420$ Kaju burfis and $130$ Badam burfis. He wants to stack them in such a way that each stack carries the same number of items and they take up the least area of the tray. What is the maximum number of burfis that can be placed in each stack for this purpose?