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11. 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 :

8 days | 10 days | 12 days | 15 days |

12. 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 :

4 days | 6 days | 8 days | 18 days |

13. A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is :

$ \dfrac{1}{4} $ | $ \dfrac{1}{10} $ | $ \dfrac{7}{15} $ | $ \dfrac{8}{15} $ |

14. A can finish a work in 24 days, B in 9 days and C in 12 days. B and C start the work but are forced to leave after 3 days. The remaining work was done by A in:

5 days | 6 days | 10 days | 10$ \dfrac{1}{2} $days |

15. A and B can do a work in 8 days, B and C can do the same work in 12 days. A, B and C together can finish it in 6 days. A and C together will do it in :

4 days | 6 days | 8 days | 12 days |

16. X can do a piece of work in 40 days. He works at it for 8 days and then Y finished it in 16 days. How long will they together take to complete the work?

13$ \dfrac{1}{3} $days | 15 days | 20 days | 26 days |

17. A can do a piece of work in 4 hours; B and C together can do it in 3 hours, while A and C together can do it in 2 hours. How long will B alone take to do it?

8 hours | 10 hours | 12 hours | 24 hours |

18. Ravi and Kumar are working on an assignment. Ravi takes 6 hours to type 32 pages on a computer, while Kumar takes 5 hours to type 40 pages. How much time will they take, working together on two different computers to type an assignment of 110 pages?

7 hours 30 minutes | 8 hours | 8 hours 15 minutes | 8 hours 25 minutes |

19. Sakshi can do a piece of work in 20 days. Tanya is 25% more efficient than Sakshi. The number of days taken by Tanya to do the same piece of work is:

15 | 16 | 18 | 25 |

20. 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 till the completion of the work. How long did the work last?

6 days | 10 days | 15 days | 20 days |

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