$? \times 15 = 37.5 \%$ of $220$

The population of a town increased from $1,75,000$ to $2,62,500$ in a decade. The average per cent increase of population per year is

If $30 \%$ students failed in English,$45 \%$ failed in Math,and $25 \%$ failed in both,then what is the percentage of students who passed in both subjects (in $\%$)?

Two tailors $X$ and $Y$ are paid a total of ₹ $550$ per week by their employer. If $X$ is paid $120$ percent of the sum paid to $Y$,how much is $Y$ paid per week?

$25 \%$ of $25 \% = ?$

The number of students in a class is increased by $20 \%$ and the number now becomes $66$. Initially,the number was: