| 21. | A takes twice as much time as B or thrice as much time as C to finish a piece of work. Working together, they can finish the work in 2 days. B can do the work alone in: |
| a. | 4 days |
| b. | 6 days |
| c. | 8 days |
| d. | 12 days |
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Answer: (b).6 days
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| 22. | A and B can complete a work in 15 days and 10 days respectively. They started doing the work together but after 2 days B had to leave and A alone completed the remaining work. The whole work was completed in : |
| a. | 8 days |
| b. | 10 days |
| c. | 12 days |
| d. | 15 days |
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Answer: (c).12 days
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| 23. | A and B can do a piece of work in 30 days, while B and C can do the same work in 24 days and C and A in 20 days. They all work together for 10 days when B and C leave. How many days more will A take to finish the work? |
| a. | 18 days |
| b. | 24 days |
| c. | 30 days |
| d. | 36 days |
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Answer: (a).18 days
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| 24. | A works twice as fast as B. If B can complete a work in 12 days independently, the number of days in which A and B can together finish the work in : |
| a. | 4 days |
| b. | 6 days |
| c. | 8 days |
| d. | 18 days |
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Answer: (a).4 days
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| 25. | Twenty women can do a work in sixteen days. Sixteen men can complete the same work in fifteen days. What is the ratio between the capacity of a man and a woman? |
| a. | 3 : 4 |
| b. | 4 : 3 |
| c. | 5 : 3 |
| d. | Data inadequate |
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Answer: (b).4 : 3
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