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

The length and breadth of a square are increased by $30 \%$ and $20 \%,$ respectively. The area of the rectangle so formed exceeds the area of the square by:

$67 \%$ of $801 - 231.17 = ? - 23 \%$ of $789$

If $35 \%$ of a number is $12$ less than $50 \%$ of that number,then the number is:

If $A$ is $150 \%$ of $B$,then $B$ is what percent of $A+B$?

If $8 \%$ of the people eligible to vote are between $18$ and $21$ years of age,and in an election,$85 \%$ of those eligible to vote who were between $18$ and $21$ years of age actually voted,then the number of persons between $18$ and $21$ years of age who actually voted is what percent of the total people eligible to vote?