Aptitude and Reasoning Questions

Q:

What is the next number in this series ? 

4, 6, 12, 18, 30, 42, 60, ?

A) 71 B) 72
C) 73 D) 69
 
Answer & Explanation Answer: B) 72

Explanation:

With close observation, you will note that each number in the list is in the middle of two prime numbers. Thus:

4 is in the middle of 3 and 5, 6 is in the middle of 5 and 7, 12 is in the middle of 11 and 13, 18 is in the middle of 17 and 19, 30 is in the middle of 29 and 31. 42 is in the middle of 41 and 43, 60 is in the middle of 59 and 61.

Therefore, the next number would be the one that is in the middle of the next two prime numbers, which is 72 (which is in the middle of 71 and 73).

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Filed Under: Odd Man Out
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11 114082
Q:

What is the next number of the following sequence ?

21, 77, 165, 285, ......

A) 404 B) 415
C) 426 D) 437
 
Answer & Explanation Answer: D) 437

Explanation:

The series follow the rule,

 


21 = 
77 = 92-4
165 = 132-4
285 = 172-4


5,9,13,17,21,(+4)...
In the same way next no. will be
212-4 = 441 - 4 = 437

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Filed Under: Number Series
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50 113604
Q:

If the following five names which name will come  in the last in a telephone directory ?

a) Mahinder  b) Mahender  c) Mahindra  d) Mahendra  e) Mohinder

A) Mahinder B) Mahindra
C) Mohinder D) Mahender
 
Answer & Explanation Answer: C) Mohinder

Explanation:

The given names will be arranged in the alphabetical order as : Mahender, Mahendra, Mahinder, Mahindra, Mohinder. Clearly, 'Mohinder' comes last.

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Filed Under: Alphabet Test
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40 113121
Q:

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

 

Which letter is in the middle between the ninth letter from the right and eighth letter from the left in the given alphabets?

A) N B) O
C) L D) M
 
Answer & Explanation Answer: D) M

Explanation:

9th letter from the right means (26 - 9 + 1 =) 18th letter from the left. Now, the middle letter between 18th letter from the left  and 8th letter from the left = [(18+8)/2] = 13th leter from the left = M.

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33 112383
Q:

What should come in place of question mark (?) in the following question?

115 ÷ 5 + 12 × 6 = ? + 64 ÷ 4 - 35

A) 95 B) 136
C) 102 D) 74
 
Answer & Explanation Answer:

Explanation:

 As per the BODMAS rule, the priority in which the operations should be done is:

Priority wise operations Symbol
B-Bracket ()
O-of of
D-Division /,÷
M-Multiplication *,x
A-Addition +
S-Subtraction -

Note: Addition and subtraction can be treated on same priority (from left to right) when they are in consecutive order.

(115/5) + 12 × 6 = ? + (64/4) – 35 23 + 72 = ? + 16 – 35 95 = ? - 19 95+19 = ? ? = 114

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2 112348
Q:

A bag contains 4 white, 5 red and 6 blue balls. Three balls are drawn at random from the bag. The probability that all of them are red, is:

A) 2/91 B) 1/22
C) 3/22 D) 2/77
 
Answer & Explanation Answer: A) 2/91

Explanation:

Let S be the sample space.

Then, n(S) = number of ways of drawing 3 balls out of 15 = 15C3  =15*14*133*2*1= 455.  

Let E = event of getting all the 3 red balls.

 n(E) = 5C3 = 5*42*1 = 10.

 => P(E) = n(E)/n(S) = 10/455 = 2/91.

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Filed Under: Probability

214 111487
Q:

In the following question, select the related word pair from the given alternatives.

Hospital : Treatment : : ? : ?

 

A) Product : Production B) Government : Country
C) Justice : Court D) School : Education
 
Answer & Explanation Answer: D) School : Education

Explanation:
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Filed Under: Analogy
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1 111479
Q:

What should come in place of question mark (?) in the following question?

600 + 300 ÷ 15 = ? × 31

A) 18 B) 25
C) 40 D) 20
 
Answer & Explanation Answer: D) 20

Explanation:

As per the BODMAS rule, Addition and subtraction can be treated on same priority (from left to right) when they are in consecutive order. 600 + (300/15) = ? × 31 600 + 20 = ? × 31 ? = 620/31 = 20

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Filed Under: Number Series

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