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 $\%$)?

$3.5$ can be expressed in terms of percentage as

The number which exceeds $16 \%$ of it by $42$ is:

An army lost $10 \%$ of its men in war,$10 \%$ of the remaining died due to disease,and $10 \%$ of the rest were declared disabled. Thus,the strength of the army was reduced to $7,29,000$ active men. What was the original strength of the army?

In a recent opinion poll held during April,$60 \%$ of the respondents favoured India Against Corruption $(IAC)$ while the rest favoured Indian political parties $(IPP).$ It was found in May polls that $10 \%$ of $IAC$ supporters switched their preference to $IPP,$ while the same percentage of $IPP$'s supporters also switched their preference to $IAC.$ What percentage of the electorate should now switch their preference from $IAC$ to $IPP$ so that they are at par?

If the length of a rectangle is increased by $20\%$ and its breadth is decreased by $10\%$,what will be the impact on its area?