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? [2 marks]

Answer 1

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

Here, the number of persons and the number of days are in inverse proportion.
[0.5 marks]

$\therefore \frac{2}{x}=\frac{1}{3}\Rightarrow x\times 1=2\times 3\Rightarrow x=\frac{2\times 3}{1}=6persons$
​​​​​​​[1 marks]