The value of $\frac{3.157 \times 4126 \times 3.198}{63.972 \times 2835.121}$ is nearer to

If $x=2$,then find the value of $x^{3}+27x^{2}+243x+631$.

The value of $(1-\sqrt{2})+(\sqrt{2}-\sqrt{3})+(\sqrt{3}-\sqrt{4})+\ldots+(\sqrt{15}-\sqrt{16})$ is

What is the difference between the biggest and the smallest fraction among $\frac{2}{3}, \frac{3}{4}, \frac{4}{5}$ and $\frac{5}{6}$?

In a pair of fractions,fraction $A$ is twice the fraction $B$ and the product of the two fractions is $\frac{2}{25}.$ What is the value of fraction $A$?

What will come in place of the question mark (?) in the following expression?
$5 \frac{17}{37} \times 4 \frac{51}{52} \times 11 \frac{1}{7} + 2 \frac{3}{4} = ?$