We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.More informationAgree

A contractor estimates that he can have the building construction completed in $40$ days by employing $15$ workers. After $12$ days of work, the work is paused for a week since he runs out of the building materials. How many workers must he add so that the building construction can be completed in time?

Assume, $15$ workers worked for $12$ days, then work is paused for a week, then $x$ workers worked for remaining $(40-12-7)$ days and completed the work.