Aptitude and Reasoning Questions

Q:

In a box, there are 9 blue, 6 white and some black stones. A stone is randomly selected and the probability that the stone is black is ¼. Find the total number of stones in the box? 

A) 15 B) 18
C) 20 D) 24
 
Answer & Explanation Answer: C) 20

Explanation:

We know that, Total probability = 1

Given probability of black stones = 1/4

=> Probability of blue and white stones = 1 - 1/4 = 3/4

But, given blue + white stones =  9 + 6 = 15

Hence,

3/4 ----- 15

 1   -----  ?

=> 15 x 4/3 = 20.

 

Hence, total number of stones in the box = 20.

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Filed Under: Probability
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Q:

The probability that a bowler bowled a ball from a point will hit by the batsman is ¼. Three such balls are bowled simultaneously towards the batsman from that very point. What is the probability that the batsman will hit the ball ?

A) 37/64 B) 27/56
C) 11/13 D) 9/8
 
Answer & Explanation Answer: A) 37/64

Explanation:

Probability of not hitting the ball = 1- 1/4 =IBPS RRB Clerk Level Quiz : Quantitative Aptitude | 11 -09 - 17
Then, the probability that the batsman will hit the ball =IBPS RRB Clerk Level Quiz : Quantitative Aptitude | 11 -09 - 17

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Filed Under: Probability
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Q:

When 721+722+723+724 is divided by 25 the remainder is:

A) 5 B) 17
C) 7 D) 0
 
Answer & Explanation Answer: D) 0

Explanation:

Given,721+722+723+724

721(1 + 7 + 49 + 343)
721(400)

Now, 400 is divisible by 25. The remainder will be 0

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Filed Under: Simplification
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2 5403
Q:

The Highway police authority put up large boards at regular intervals indicating the speed limit and dangers of over-speeding on the highways.

Assumptions: 

I. Most of the motorists may drive their vehicles within the speed limit on the highways.

II. Motorists generally ignore such cautions and over-speed on the highways.

A) If only assumption I is Implicit B) If only assumption II is Implicit
C) If either I or II is Implicit D) If both I and II are Implicit
 
Answer & Explanation Answer: A) If only assumption I is Implicit

Explanation:

The boards have been put with the assumption that they may have a positive impact.

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Q:

Spelling test - find correct spelling :

A) Skillfull B) Skillfful
C) Skillful D) Skkillful
 
Answer & Explanation Answer: C) Skillful

Explanation:
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Q:

Consider the given argument and decide which of the given assumptions is/are implicit.

Argument :
All girls love reading novels.

Assumptions :
1. Novels are the only reading materials.
2. No girl loves to read other materials.

 

A) Both assumptions 1 and 2 are implicit B) Only assumption 1 is implicit
C) Neither assumption 1 nor 2 is implicit D) Only assumption 2is implicit
 
Answer & Explanation Answer: C) Neither assumption 1 nor 2 is implicit

Explanation:
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Filed Under: Statement and Assumptions
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Q:

Consider the argument and decide which of the given assumptions is/are implicit.

Argument :

A top university has reduced the syllabus of Mathematics in Class 12.

Assumptions:

1. Students can score more marks than before in Mathematics.
2. This has been done to reduce the stress and burden of the students in Mathematics.

 

A) Only assumption 2 is implicit B) Both 1 and 2 are implicit
C) Only assumption 1 is implicit D) Neither 1 and 2 is implicit
 
Answer & Explanation Answer: A) Only assumption 2 is implicit

Explanation:
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Filed Under: Statement and Assumptions
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Q:

Count the number of cubes in the given figure.

A) 64 B) 66
C) 68 D) 70
 
Answer & Explanation Answer: C) 68

Explanation:

In the figure, there are 34 columns containing 2 cubes each.

  Total number cubes = (34 x 2) = 68

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Filed Under: Cubes and Dice
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