A) 5
B) 3
C) 6
D) 9
By using Flip rule:
So,
A’s 1 day work = 1/10
B’s 1 day work = 1/15
(A+B)’s 1 day work =
(1/10+1/15)= (3 + 2)/30 = 5/30= 1/6
So together they can complete work in 6 days.
Related MCQs:
- A is twice as good as workman as B and together they finish a piece of work in 18 days. In how many days will B alone finish the work?
- 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?
- 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?
- If A and B together can complete a piece of work in 15 days and B alone in 20 days, in how many days can A alone complete the work?