Aptitude and Reasoning Questions

Q:

What is the probability of getting at least one six in a single throw of three unbiased dice?

A) 1/36 B) 91/256
C) 13/256 D) 43/256
 
Answer & Explanation Answer: B) 91/256

Explanation:

Find the number of cases in which none of the digits show a '6'.

i.e. all three dice show a number other than '6', 5×5×5=125 cases.

Total possible outcomes when three dice are thrown = 216.

The number of outcomes in which at least one die shows a '6' = Total possible outcomes when three dice are thrown - Number of outcomes in which none of them show '6'.

=216−125=91

The required probability = 91/256

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Filed Under: Probability

27 20026
Q:

A boatman can row 3 km against the stream in 20 minutes and return in 18 minutes. Find the rate of current ?

A) 1/3 kmph B) 2/3 kmph
C) 1/4 kmph D) 1/2 kmph
 
Answer & Explanation Answer: D) 1/2 kmph

Explanation:

Speed in upstream = Distance / Time = 3 x 60/20 = 9 km/hr.

Speed in downstream = 3 x 60/18 = 10 km/hr

Rate of current = (10-9)/2 = 1/2 km/hr.

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Filed Under: Boats and Streams
Exam Prep: AIEEE , Bank Exams , CAT , GATE
Job Role: Bank Clerk , Bank PO

32 20025
Q:

The present average age of a family of five members is 26 years. If the present age of the youngest member in the family is ten years, then what was the average age of the family at the time of the birth of the youngest member ? (Assume no death occurred in the family since the birth of the youngest)

A) 19 years B) 16 years
C) 18 years D) 20 years
 
Answer & Explanation Answer: D) 20 years

Explanation:

Present total age of the members = 26(5) = 130 years.

 

Present age of the youngest member = 10 years

 

Present total age of the remaining four members = 130 -10 = 120 years

 

Their average age at the time of the birth of the youngest member = 120-4×104 = 30 - 10 = 20 years.

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Filed Under: Problems on Ages
Exam Prep: GATE , CAT , Bank Exams , AIEEE
Job Role: Bank PO , Bank Clerk

19 20014
Q:

What is the minimum number of straight lines required to construct the following figure?

 

A) 13 B) 11
C) 14 D) 12
 
Answer & Explanation Answer: A) 13

Explanation:
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Filed Under: Image Analysis
Exam Prep: Bank Exams

0 19996
Q:

The following table shows the number of children in each house of a society.

What is the average number of children per house?

 

A) 2.04 B) 1.79
C) 2.29 D) 1.54
 
Answer & Explanation Answer: B) 1.79

Explanation:
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Filed Under: Table Charts
Exam Prep: Bank Exams

0 19994
Q:

From the given words, select the word which cannot be formed using the letters of the given word.

DISSERTATION

A) SISTER B) STATION
C) DIRECTION D) RATION
 
Answer & Explanation Answer: C) DIRECTION

Explanation:
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Filed Under: Logical Sequence of Words
Exam Prep: Bank Exams

1 19988
Q:

Pointing to a photograph, Vipul said, "She is the daughter of my grandfather's only son." How is Vipul related to the girl in the photograph ?

A) Father B) Brother
C) Cousin D) Data inadequate
 
Answer & Explanation Answer: B) Brother

Explanation:

My grandfather's only son — My father. So, the girl is the daughter of Vipul's father i.e., Vipul is the girl's brother. 

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Filed Under: Blood Relations

21 19979
Q:

Choose the correct figure that replaces the question mark.

 

A) C B) A
C) D D) B
 
Answer & Explanation Answer: A) C

Explanation:
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Filed Under: Image Analysis
Exam Prep: Bank Exams

0 19967