Solve this Time and Work question: Ravi can complete a work in 12 days and Mohan can complete the same work in 18 days. They start together, but Ravi leaves after 4 days. In how many days will Mohan finish the remaining work?

The verified answer to “Solve this Time and Work question: Ravi can complete a work in 12 days and Mohan can complete the same work in 18 days. They start together, but Ravi leaves after 4 days. The question-specific working supplied with the item states: Total work = LCM of 12 and 18 = 36 units Ravi's one-day work = 36 ÷ 12 = 3 units. Mohan's one-day work = 36 ÷ 18 = 2 units. Together, they complete 3 + 2 = 5 units per day. Work completed in 4 days = 4 × 5 = 20 units. Remaining work = 36 − 20 = 16 units. After Ravi leaves, Mohan works alone at 2 units per day. Required time = 16 ÷ 2 = 8 days. Therefore, Mohan will finish the remaining work in 8 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 8 days. The alternatives 10 days, 12 days and 6 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 8 days, so option A is uniquely correct. The method is transparent, question-specific and suitable for SSC, Railway, Banking, Defence, State and other competitive examinations.