$90 \times \frac{6}{18} + 73 = ?$

$\sqrt{2498} \times \sqrt{626} \div \sqrt{99} = ?$

If the sum of a number and its square is $182$,what is the number?

The ten's digit of a two-digit number is greater than the unit's digit by $7$. If we subtract $63$ from the number,the new number obtained is formed by interchanging the digits. Find the number.

Find the least values of $x$ and $y$ so that the number $5x423y$ is divisible by $88$.

If a six-digit number $53a29b$ is divisible by $88$,then find the value of $a$ and $b$.