Question

Question 06.
A contractor estimates that 3 persons could rewire Jasminder’s house in 4 days. If, he uses 4 persons instead of three, how long should they take to complete the job?

Answer 1

Let time taken to complete the job be x
$\begin{array}{ccc}Persons& 3& 4\\ Days& 4& x\end{array}$
Here the number of persons and the number of days are in inverse proportion.
$\therefore \frac{x}{4}=\frac{3}{4}\Rightarrow 4\times x=3\times 4\Rightarrow x=\frac{3\times 4}{4}=3days$
Hence, they will complete the job in 3 days.