$x \%$ of $y + ? \%$ of $x = x \%$ of $(x + y)$

If the length and breadth of a rectangular field are increased,the area increases by $50 \%$. If the length is increased by $20 \%$,by what percentage was the breadth increased?

If $\frac{3}{5}$ of a number is $23$ more than $50 \%$ of the same number,then what will be $80 \%$ of the number?

Sonal spent $Rs. 45760$ on the interior decoration for her home,$Rs. 27896$ on buying an air conditioner,and the remaining $28 \%$ of the total amount she had as cash with her. What was the total amount?

In an office,$40 \%$ of the staff is female,$70 \%$ of the female staff and $50 \%$ of the male staff are married. The percentage of the unmarried staff in the office is

The population of Delhi two years ago was $55000$. It increased by $12 \%$ in the first year and decreased by $15 \%$ in the second year. What was the population of the town at the end of $2$ years?