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Q1. | A and B can do a piece of work in 72 days; B and C can do it in 120 days; A and C can do it in 90 days. In what time can A alone do it ? |

A. | 80 days [Wrong Answer] |

B. | 100 days [Wrong Answer] |

C. | 120 days [Correct Answer] |

D. | 150 days [Wrong Answer] |

View Answer
Explanation:-
Answer : CDiscuss it below :(A + B)'s 1 day's work = ^{1}/_{72}^{1}/_{120}^{1}/_{90}^{ 1 }_{ + } ^{ 1 }_{ + } ^{ 1 }^{72} ^{120} ^{90}
= ^{12}/_{360}^{1}/_{30}^{1}/_{60}^{1}/_{60}^{1}/_{120}^{1}/_{120}!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

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