Sanjay and Rohan can complete a work in 8 days and 12 days, respectively. Starting with Sanjay, they work on alternate days. In how many days will the work be completed?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 9
Concept used:
Total work = Time × Efficiency
Calculations
Total work done (LCM of 8 and 12) = 24 units
Efficiency of Sanjay = 24/8 = 3
Efficiency of Rohan = 24/12 = 2
Work done in 2 days = 5 units
Work done in 8 days = 20 units
Work done in 9 days = 23 units
Work done in 9(1/2) days = 24 units