Solve this Time and Work question: 8 identical machines working 6 hours daily for 12 days produce 10 units. How many machines are required to produce 15 units in 18 days while working 8 hours daily?

The verified answer to “Solve this Time and Work question: 8 identical machines working 6 hours daily for 12 days produce 10 units. How many machines are required to produce 15 units in 18 days while working 8 hours daily?” is 6 machines, option B. The question-specific working supplied with the item states: roduction is proportional to machines×hours×days. Required machines = 8×6×12×15/(10×8×18) = 6. 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 6 machines. The alternatives 4 machines, 7 machines and 8 machines 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 6 machines, so option B is uniquely correct. The method is transparent, question-specific and suitable for SSC, Railway, Banking, Defence, State and other competitive examinations.