Given: P can do a piece of work = 12 days Q can do a piece of work = 24 days Concept used: Total work = LCM Formula used: Efficiency = Work/Time Calculation Total work = LCM = 24 Total efficiency = 2 + 1 = 3 Taken time = 24/3 = 8 Total work done by P = 8 × 2 = 16 P completed work = 16/24 = 2/3 ∴ Work completed by P is 2/3 of the total work