Solve this Time and Work question: 30 workers can complete a construction job in 12 days. After 4 days, 10 workers leave. How many more days will the remaining workers need?

The verified answer to “Solve this Time and Work question: 30 workers can complete a construction job in 12 days. After 4 days, 10 workers leave. How many more days will the remaining workers need?” is 12 days, option D. The question-specific working supplied with the item states: otal work = 30×12 = 360 worker-days. Work done = 30×4 = 120. Remaining workers = 20; time = (360-120)/20 = 12 days. This working identifies the relevant work-rate equation and connects the given information to the required result. After applying the verified rule, the required value or position is 12 days. The alternatives 13 days, 14 days and 10 days fail because each breaks at least one stated condition, transition, direction or arithmetic step. A plausible-looking option is not sufficient unless it reproduces the complete work-rate equation. This full replay leads only to 12 days, so option D is uniquely correct. The method is transparent, question-specific and suitable for SSC, Railway, Banking, Defence, State and other competitive examinations.