21 .
A and B can together finish a work 30 days. They worked together for 20 days and then B left. After another 20 days, A finished the remaining work. In how many days A alone can finish the work?

A. | 40 days | B. | 23 days |

C. | 35 days | D. | 42 days |

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 compl

A. | 8 days | B. | 10 days |

C. | 12 days | D. | 15 days |

23 .
A work which could be finished in 9 days was finished 3 days earlier after 10 more men joined. The number of men employed was?

A. | 18 | B. | 20 |

C. | 22 | D. | 24 |

24 .
A and B can do a piece of work in 7 days. With the help of C they finish the work in 5 days. C alone can do that piece of work in?

A. | 1 day | B. | 10 days |

C. | 30 days | D. | 32 days |

25 .
A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work?

A. | 45/2 days | B. | 55 days |

C. | 65/2 days | D. | 75/2 days |

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