In 20 days, A completes 80% of the task. He then summons B, and the two of them labour together for the next three days to complete the remaining tasks. How long would it take B to complete the project on his own?
A. 23 days
B. 37 days
C. 37 1/2 days
D. 40 days
Answer:C
In 20 days, A completes 80% of the task. He then summons B, and the two of them labour together for the next three days to complete the remaining tasks. How long would it take B to complete the project on his own?
A. 23 days B. 37 days C. 37 1/2 days D. 40 days
Explanation: A completes the task in ( 20 x 5/4 ) = 25 days.Now, A and B have completed ( 1 - 4/5 ) of the job in 3 days.A and B will complete the project in 3 x 5 = 15 days.1 day's labour for A = 1/25, 1 day's work for (A + B) = 1/15As a result, B's 1 day's labour Equals ( 1/15 - 1/25 ) = 4/150 = 2/75.As a result, B could complete the task in 75/2 = 37 1/2 days if he worked alone.