A is twice as good a workman as B and they took 7 days together to do the work B alone can do it in.
A). 12 days
B). 18 days
C). 21 days
D). 27 days
21 days
WC = 2:12x + x = 1/7x = 1/21 => 21 days
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1. A is 60% more efficient than B. In how many days will A and B together complete a piece of work if A alone can complete the work in 15 days?
2. A can do a work in 20 days and B in 10 days. If they work on it together for 5 days, then what fraction of work is left.
3. A can do a piece of work in 80 days. He works at it for 10 days and then B alone finishes the remaining work in 42 days. In how much time will A and B, working together, finish the work?
4. Given below are two quantities named A and B. Based on the given information, you have to determine the relation between the two quantities. You should use the given data and your knowledge of Mathematics to choose among the possible answers. Quantity A: Sammy is twice as good workman as Billy. Sammy finished a piece of work in 6 hours less than Billy. In how many hours could they have finished that piece of work working together? Quantity B: 5
5. While working 7 hours a day. A alone can complete a piece of in 6 days and B alone in 8 days. In what time would they complete it together, working 8 hours a day ?
6. If the expenditure of gas on burning 6 burners for 6 hours a day for 8 days is Rs. 450, then how many burners can be used for 10 days at 5 hours a day for Rs. 625 ?
7. A does $\frac{4}{5}$ of a piece of work in 20 days; He then calls in B and they finish the remaining work in 3 days. How long B alone will take to do whole work ?
8. 2 men 3 women and a boy can complete a job in 3, 4 and 12 days respectively. How many boys must assist one men one women to complete the job in 1/4 of a day?
9. 20 men can do a piece of work in 18 days. They worked together for 3 days, then 5 men Joined them. In how many more days is the work completed ?
10. A and B can complete a piece of work in 30 days, B and C in 20 days, while C and A in 15 days If all of them work together, the time taken in completing the work will be
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