Q:

A) 18 days | B) 24 days |

C) 30 days | D) 36 days |

Answer: A) 18 days

Explanation:

Explanation:

2(A+B+C)'s 1 day work = 1/30 + 1/24 + 1/20 = 1/8

=>(A+B+C)'s 1 day's work= 1/16

work done by A,B and C in 10 days=10/16 = 5/8

Remaining work= 3/8

A's 1 day's work= $\left(\frac{1}{16}-\frac{1}{24}\right)=\frac{1}{48}$

Now, 1/48 work is done by A in 1 day.

So, 3/8 work wil be done by A in =48 x (3/8) = 18 days

Q:

A) 12 days | B) 8 days |

C) 14 days | D) 16 days |

8
1216

9
847

Q:

A) 16.5 days | B) 13 days |

C) 10 days | D) 12.5 days |

8
750

5
695

6
667

Q:

A) 112days | B) 3 days |

C) 4 days | D) 2 days |

3
909

1
743

Q:

A) 100 days | B) 120 days |

C) 72 days | D) 64 days |

5
1052