$\frac{0.009}{?} = 0.01$

By which least number should $5000$ be divided so that it becomes a perfect square?

$7 \frac{11}{18} + 13 \frac{1}{9} + 5 \frac{7}{9} - 16 \frac{2}{3} = ?$

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:

$\frac{\sqrt{7}}{\sqrt{16+6 \sqrt{7}}-\sqrt{16-6 \sqrt{7}}}$ is equal to

$1+\frac{1}{2}+\frac{1}{4}+\frac{1}{7}+\frac{1}{14}+\frac{1}{28}$ is equal to