3100+ Mental Ability Reasoning Questions and Answers with Explanation

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 = $5^{2}-4$
77 = $9^{2} - 4$
165 = $13^{2} - 4$
285 = $17^{2} - 4$

5,9,13,17,21,(+4)...
In the same way next no. will be
$21^{2} - 4$ = 441 - 4 = 437

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Filed Under: Number Series
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50 100985

Q:

In a certain code language, 'dom put ta' means 'bring hot food';

'put tir sop' means 'food is good' and

'tak da sop' means 'good bright boy'.

Which of the following does mean 'hot' in that language ?

A) dom	B) pul
C) ta	D) Can't be determined

Answer & Explanation Answer: D) Can't be determined

Explanation:

Justification:

We can find the code for 'food' form the first and second statements.
Now, to find the code for 'hot',
we need to the code for 'bring' which cannot be determined from the given information.

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Filed Under: Coding and Decoding

59 100964

Q:

Find the wrong number in the series.

3, 8, 15, 24, 34, 48, 63

A) 15	B) 24
C) 34	D) 48

Answer & Explanation Answer: C) 34

Explanation:

The difference between consecutive numbers of the given series are respectively 5, 7, 9, 11, 13, and 15.

Therefore, 24+11=35 But in your problem it is given as 34.so 34 is wrong number

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Filed Under: Number Series

364 99715

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

4 98839

Q:

Fill in the blanks with the appropriate words.

Countries which _________ still undergoing the economic processes
_________ known as developing countries.

A) are, are	B) are, is
C) is, are	D) were, are

Answer & Explanation Answer: A) are, are

Explanation:

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Filed Under: Analogy
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25 98820

Q:

The following question is based on the given data for an examination.

A. Candidates appeared 10500

B. Passed in all the five subjects 5685

C. Passed in three subjects only 1498

D. Passed in two subjects only 1250

E. Passed in one subject only 835

F. Failed in English only 78

G. Failed in Maths only 275

H. Failed in Physics only 149

I. Failed in Chemistry only 147

J. Failed in Biology only 221

How many candidates passed in at least four subjects ?

A) 6555	B) 5685
C) 1705	D) 870

Answer & Explanation Answer: A) 6555

Explanation:

Candidates passed in atleast four subjects

= (Candidates passed in 4 subjects) + (Candidates Passed in all 5 subjects)

= (Candidates failed in only 1 subject ) + ( Candidates passed in all subjects)

= (78 + 275 + 149 + 147 + 221) + 5685 = 870 + 5685 = 6555

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Filed Under: Arithmetical Reasoning

68 97632

Q:

Select the related number from the given alternatives.

236 : 472 :: 123 : ?

A) 246	B) 426
C) 642	D) 247

Answer & Explanation Answer: A) 246

Explanation:

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Filed Under: Analogy
Exam Prep: Bank Exams

1 97476

Q:

Arrange the given words in a meaningful sequence.

1. Rainbow 2. Rain 3. Sun 4. Happy 5. Child

A) 4, 2, 3, 5, 1	B) 2, 3, 1, 5, 4
C) 4, 5, 1, 2, 3	D) 2, 1, 4, 5, 3

Answer & Explanation Answer: B) 2, 3, 1, 5, 4

Explanation:

The Correct Sequence is:

Rain Sun Rainbow Child Happy

2 3 1 5 4

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Filed Under: Logical Sequence of Words

27 97421

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