Question

Two persons could fit new windows in a house in 3 days.
How many persons would be needed to fit the windows in one day?

Answer 1

Let the number of persons be $x$.
$\begin{array}{ccc}\text{Persons}& 2& x\\ \text{Days}& 3& 1\end{array}$

Here, the number of persons and the number of days are in inverse proportion.

$\therefore x\times 1=2\times 3\Rightarrow x=\frac{2\times 3}{1}=6\text{persons}$