# Bank PO Questions

A) 1009 | B) 991 |

C) 2000 | D) 1000 |

Explanation:

Given total number of rats = 999919

999919 = 1000000 - 81 = = (1000+9)(1000-9) = 1009 x 991.

Since there were more rats than there were cats, 991 cats killed 1009 rats each.

A) 3/91 | B) 2/73 |

C) 1/91 | D) 3/73 |

Explanation:

In a circle of n different persons, the total number of arrangements possible = (n - 1)!

Total number of arrangements = n(S) = (15 – 1)! = 14 !

Taking three persons as a unit, total persons = 13 (in 4 units)

Therefore no. of ways for these 13 persons to around the circular table = (13 - 1)! = 12!

In any given unit, 3 particular person can sit in 3!. Hence total number of ways that any three person can sit =

n(E) = 12! X 3!

Therefore P (E) = probability of three persons sitting together = n(E) / n(S) = 12! X 3 ! / 14!

= 12!x3x2 / 14x13x12! = 6/14x13 = 3/91

A) 10.5 kgs | B) 12 kgs |

C) 9.6 kgs | D) 11.5 kgs |

Explanation:

Screws weight = 90x100 = 9000gms

bolts weight = 100 x 150 = 15000gms

weight = screws + bolts => 24000 gms =>24 kg

Given entire box weight = 35.5kg

empty box = entire box weight - weight => 35.5kg - 24kg => 11.5kg

so the empty box is 11.5kg.

A) 360 ml | B) 320 ml |

C) 310 ml | D) 330 ml |

Explanation:

Here total parts of milk and water in the solution is 6+2 = 8 parts

1part = 640/8 = 80

old mixture contains 6parts of milk and 2 parts of water(6:2).

To get new mixture containing half milk and half water, add 4parts of water to the old mixture then 6:(2+4) to make the ratio same.

i.e, 4 x 80 = 320 ml.

A) 66 sec | B) 55 sec |

C) 36 sec | D) 24 sec |

Explanation:

For ticking 6 times, there are 5 intervals.

Each interval has time duration of 30/5 = 6 secs

At 12 o'clock, there are 11 intervals,

so total time for 11 intervals = 11 x 6 = 66 secs.