Consider the following diagrams x men, working at constant speed, do a certain job in y days. Which one of these diagrams shows the relation between x and y?

Explanation:

As the number of men increase the number of days taken to do the work mus: decrease which means that diagrams

II and III are ruled out. Moreover, the men work at constant speed which means that in no case will the work

be done in zero days no matter, how many men are put to work? Thus, diagram I is ruled out because. here the

graph touches the zero line on both the axes. Thus, the right answer is diagram IV.