Question

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

Answer 1

According to the estimation in rewiring Jasminder's house

Number of persons required $=3$

Number of days required $=4$

So, to rewire a house by 1 person it will take $4\times 3=12$ days

And to do job by 4 persons, days required $=\frac{12}{4}=3$ days