A) 60
B) 45
C) 40
D) 30
Using Flip rule:
A and B complete work in = 15 days
One day’s work of (A + B) = 1/15
B complete the work in = 20 days;
One day’s work of B = 1/20
Then, A’s one day’s work
=1/15−1/20 = ( 6-5)/60= 1/60
Thus, A can complete the work in = 60 days.
Related MCQs:
- X and Y can do a piece of work in 20 days and 12 days respectively. X started the work alone, and then after 4 days, Y joined him until the completion of the work. How long did the work last?
- If A and B together can complete a job in 15 days and B alone can complete it in 20 days. In how many days can A alone complete job:
- If A and B together can complete a job in 15 days and B alone can complete it in 20 days. In how many days can A alone complete job:
- Twelve children take sixteen days to complete a work which can be completed by 8 adults in 12 days. After working for 3 days, sixteen adults left and six adults and four children joined them. How many days will it take to complete the remaining work?