A can do a work in 20 days and B in 30 days. They start together, but A leaves after 5 days. In how many days in all is the work finished?
A. 22.5 days
B. 25 days
C. 17.5 days
D. 20 days
1 answer
Best answer
Answer: A. 22.5 days
Answer: (A) 22.5 days
Work = 60 units; A = 3, B = 2 units/day. In 5 days together they do 25 units; 35 units remain.
B alone does 35 units in 35 ÷ 2 = 17.5 days. Total = 5 + 17.5 = 22.5 days.
Trap: 17.5 is only B's extra time.
Doubtly AI
· 27 Oct 2026
AI-generated · not yet verified
Report
Was this answer helpful?
Thanks for the feedback.
Sign up free to save answers and ask your own doubts
Your answer
Log in or create a free account to answer this question.