9 men can complete a work in 25 days. If 13 men work at the same rate, in how many days will the work be completed? MCQ with Answer and Explanation

Explanation:
Total work = LCM(20, 30) = 60 units. Efficiency of A = 3, B = 2. In a 2-day cycle (A then B), work completed = 3 + 2 = 5 units. Number of cycles required = 60 / 5 = 12 cycles. Total time = 12 * 2 = 24 days.

Explanation:
Combined rate = 1/20 + 1/14. Required time = 8.24 days.

Explanation:
Combined 1-day work = 1/4. A's 1-day work = 1/12. B's 1-day work = 1/4 - 1/12 = 2/12 = 1/6. Therefore, B alone can complete the work in 6 days.