A can complete a work in 19 days and B in 19 days. If both work together, in how many days will the work be completed? MCQ with Answer and Explanation

Explanation:
Combined rate = 1/22 + 1/33. Time = 13.2 days.

Explanation:
Total work = LCM(12, 15, 20) = 60 units. Efficiency of (A+B) = 5, (B+C) = 4, (C+A) = 3. Sum of efficiencies = 2 * (A+B+C) = 12 => Efficiency of (A+B+C) = 6 units/day. Time taken together = 60 / 6 = 10 days.

Explanation:
A share = (1/30) / (1/30+1/28) ×100 = 48.28%.