In a recent survey,$40 \%$ of houses contained two or more people. Of those houses containing only one person,$25 \%$ had only a male. What is the percentage of all houses that contain exactly one female and no males (in $\%$)?

In a class of $50$ students and $5$ teachers,each student received sweets equal to $12 \%$ of the total number of students,and each teacher received sweets equal to $20 \%$ of the total number of students. How many sweets were there in total?

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?

$125 \%$ of $320 + x \%$ of $125 = 440$. Find the value of $x$.

$0.06 \%$ of $250 \%$ of $1600$ is

The price of sugar is reduced by $2 \%$. How many $kg$ of sugar can now be bought for the money which was sufficient to buy $49$ $kg$ of sugar earlier?