A) 4:1 | B) 5:3 |

C) 16:1 | D) 1:16 |

Explanation:

Time taken by 8th tap = = 8 hours

and time taken by 12th tap = = hour

Ratio of time taken by 8th 8th tap and 12th tap = =16:1

Therefore, Ratio of efficiencies of 8th tap and 12th tap =1:16

A) 8 hrs 45 min | B) 8 hrs 42 min |

C) 8 hrs | D) 8 hrs 34 min |

Explanation:

Number of pages typed by Adam in 1 hour = = 6

Number of pages typed by Smith in 1 hour = = 8

Number of pages typed by both in 1 hour = (6 + 8) = 14

Time taken by both to type 110 pages = (120 * 1/14) = 8 = 8 hrs 34 min.

A) 24.5 days | B) 26.6 days |

C) 25 days | D) 20 days |

Explanation:

Arun has completed rd of the work in 8 days

Then he can complete the total work in

---- 8

1 ---- ?

= 24 days

But given Akhil is only 60% as efficient as Arun

Akhil =

Akhil can complete the total work in 40 days

Now, remaining 2/3rd of work can be completed in

1 ------ 40

------ ? 26.66 days.

A) 50 days | B) 48 days |

C) 47.5 days | D) 49 days |

Explanation:

50 men can build a tank in 40 days

Assume 1 man does 1 unit of work in 1 day

Then the total work is 50×40 = 2000 units

50 men work in the first 10 days and completes 50×10 = 500 units of work

45 men work in the next 10 days and completes 45×10 = 450 units of work

40 men work in the next 10 days and completes 40×10 = 400 units of work

35 men work in the next 10 days and completes 35×10 = 350 units of work

So far 500 + 450 + 400 + 350 = 1700 units of work is completed and

remaining work is 2000 - 1700 = 300 units

30 men work in the next 10 days. In each day, they does 30 units of work.

Therefore, additional days required =

Thus, total 10+10+10+10+10 = 50 days required.

A) 10 days | B) 15 days |

C) 20 days | D) 5 days |

Explanation:

After 10 days, the remaining food would be sufficient for the 1000 students for 20 more days

If 1000 more students are added, it shall be sufficient for only 10 days (as the no. of students is doubled, the days are halved).

A) 4:5 | B) 3:4 |

C) 4:3 | D) 2:3 |

Explanation:

(2018) men can complete the work in in one day.

one man's one day work =

(1815) women can complete the work in 1 day

1 woman's one day work =

So, required ratio = = 4:3