If $\frac{2}{3}$ part of a number is $96,$ what is the value of $\frac{3}{4}$ part of the same number?

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

$3 \frac{1}{4} + 2 \frac{1}{2} - 1 \frac{5}{6} = \frac{(?)^{2}}{10} + 1 \frac{5}{12}$

The least number to be subtracted from $16800$ to make it a perfect square is

If $a+b+c=0,$ then the value of $\frac{a^{2}+b^{2}+c^{2}}{a^{2}-b c}$ is

What approximate value will come in the place of the question mark $(?)$ in the following question? (You are not expected to calculate the exact value.)
$(32.13)^{2} + (23.96)^{2} - (17.11)^{2} = ?$