If A&B can complete a work in 3 days. They start together but after two days B left the work. If the work is completed after 2 more days B alone can do work in?(Assistant Agricultural PPSC 2022)

1st Method: (A+B)'s one day's work = 13 part (A+B) works 2 days together = 23 part Remaining work = 1−23 = 13 part 13 part of work is completed by A in two days Hence, one day's work of A = 16 Then, one day's work of B = 13−16 = 16 So, B alone can complete the whole work in 6 days. 2nd Method: (A+B)'s one day's % work = 1003 = 33.3% Work completed in 2 days = 66.6% Remaining work = 33.4% One day's % work of A = 33.42 = 16.7% One day's work of B = 33.4 - 16.7 = 16.7% B alone can complete the work in, = 10016.7 = 5.98 days ≈ 6 days.