If $x \times y = (x + 2)^2 (y - 2)$,then $7 \times 5 = ?$

Which of the following numbers is the greatest?

The difference between two numbers is $9$ and the difference between their squares is $207$. The numbers are

What should come in place of the question mark $(?)$ in the following equation?
$30.01^{2} - 19.98^{2} - ? = 21.81^{2}$

If $P = \frac{96}{9597}$,$Q = \frac{97}{96 \times 98}$,and $R = \frac{1}{97}$,then which of the following is the smallest?

While selling,a businessman allows $40 \%$ discount on the marked price and there is a loss of $30 \%$. If it is sold at the marked price,the profit percent will be: