$3640 \div 14 \times 16 + 340 = ?$

Two-fifth of one-fourth of three-seventh of a number is $15$. What is half of that number?

If $x + (1/x) = 2$,then what is the value of $x^{21} + (1/x^{1331})$?

If $N = \frac{\sqrt{6} - \sqrt{5}}{\sqrt{6} + \sqrt{5}},$ then what is the value of $N + \frac{1}{N} ?$

$\frac{0.0203 \times 2.92}{0.0073 \times 14.5 \times 0.7} = ?$

$A$ sum of $Rs. 1360$ has been divided among $A, B$ and $C$ such that $A$ gets $\frac{2}{3}$ of what $B$ gets and $B$ gets $\frac{1}{4}$ of what $C$ gets. $B$'s share is (in $Rs.$)