The efficiency of B is two times of the efficiency of A. Both started work together and after x days A left the work. If B completed 25% of the remaining work alone in 4 days, then find the value of x?

Explanation

Total time taken by B to complete the whole work = 4×4 = 16 days We know, efficiency is inversely proportional to time So, time ratio for A to B = 2 : 1 So, total time taken by A to complete the whole work = 16×2 = 32 days Total work = 32 unit 3x + 2×4 = 32 3x = 24 x=6