Solve this Time and Work question: Neeraj starts a task alone and works for 6 days. Sahil then joins, and the task is completed in 12 days from the start. If Neeraj alone takes 18 days, how many days would Sahil alone take?

The verified answer to “Solve this Time and Work question: Neeraj starts a task alone and works for 6 days. Sahil then joins, and the task is completed in 12 days from the start. If Neeraj alone takes 18 days, how many days would Sahil alone take?” is 18 days, option C. The question-specific working supplied with the item states: eeraj works throughout all 12 days and completes 12/18. Sahil works for 6 days and completes the remaining 0.33. Therefore Sahil's time = (6)/(0.33) = 18 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 18 days. The alternatives 19 days, 20 days and 17 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 18 days, so option C is uniquely correct. The method is transparent, question-specific and suitable for SSC, Railway, Banking, Defence, State and other competitive examinations.