Instructions: DO NOT USE CALCULATOR. Figures are not drawn to scale. if x men can do a work in y days, how many days will it take (x + z) men to do the same work?
Explanation: (A) This is an inverse proportionality problem (more men, less days). The total amount of work is proportional to the number of men multiplied by the number of days: \(W = M \cdot D\). Since the work is the same: \(x \cdot y = (x + z) \cdot D_2\). Solving for the new number of days \((D_2)\): \(D_2 = \frac{xy}{x + z}\).
