$425 \div 16.95 \times ? = 225$

$\frac{\frac{64}{121}-\frac{9}{64}}{\frac{8}{11}+\frac{3}{8}} = ?$

When simplified,the value of the product $\left(1-\frac{1}{2}\right)\left(1-\frac{1}{3}\right)\left(1-\frac{1}{4}\right) \ldots\left(1-\frac{1}{n}\right)$ equals

Which one of the following is the smallest fraction?
$\frac{6}{11}, \frac{13}{17}, \frac{19}{27}, \frac{21}{23}, \frac{5}{7}$

If the sum of squares of two real numbers is $41$ and their sum is $9,$ then the sum of cubes of these two numbers is

The correct expression of $5 . \overline{45}$ in the fractional form is