Question

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

Find the number of days required to rewire a house in given condition.

Given: $3$ persons can rewire a house in $4$ days.

So, $1$ person will rewire the same house in $=3\times 4$

$\Rightarrow$ $=12$ days.

Thus, $4$ persons will rewire the house in $=\frac{12}{4}$

$\Rightarrow$ $=3$ days.

Hence, $4$ persons will take $3$ days to complete the job.