Aptitude and Reasoning Questions

Q:

A bag contains 4 red and 3 black balls. A second bag contains 2 red and 4 black balls. One bag is selected at random. From the selected bag, one ball is drawn. Find the probability that the ball drawn is red.

A) 23/42 B) 19/42
C) 7/32 D) 16/39
 
Answer & Explanation Answer: B) 19/42

Explanation:

A red ball can be drawn in two mutually exclusive ways

 (i) Selecting bag I and then drawing a red ball from it.

 

(ii) Selecting bag II and then drawing a red ball from it.

 

Let E1, E2 and A denote the events defined as follows:

E1 = selecting bag I,

E2 = selecting bag II

A = drawing a red ball

Since one of the two bags is selected randomly, therefore 

P(E1) = 1/2  and  P(E2) = 1/2

Now, PAE1 = Probability of drawing a red ball when the first bag has been selected = 4/7

  PAE2  = Probability of drawing a red ball when the second bag has been selected = 2/6

 Using the law of total probability, we have 

 P(red ball) = P(A) = PE1×PAE1+PE2×PAE2 

 

                          = 12×47+12×26=1942

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Filed Under: Probability
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64 28089
Q:

The length of the room is 5.5m and width is 3.75m. Find the cost of paving the floor by slabs at the rate of Rs.800 per sq meter

A) Rs.16500 B) Rs.15500
C) Rs.17500 D) Rs.18500
 
Answer & Explanation Answer: A) Rs.16500

Explanation:

l=5.5m w=3.75m
area of the floor = 5.5 x 3.75 = 20.625 sq m
cost of paving = 800 x 20.625 = Rs. 16500

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Filed Under: Area
Exam Prep: Bank Exams
Job Role: Bank PO

18 28082
Q:

The following equation is incorrect. Which two signs should be interchanged to correct the equation?

 

17 x 6 + 2 - 9 ÷ 2 = 44

 

A) - and + B) ÷ and x
C) x and - D) + and ÷
 
Answer & Explanation Answer: D) + and ÷

Explanation:
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Filed Under: Coding and Decoding
Exam Prep: Bank Exams

0 28080
Q:

In the following question, select the missing number from the given series.

 

19, 26, 40, 61, ?, 124

 

A) 89 B) 82
C) 65 D) 98
 
Answer & Explanation Answer: A) 89

Explanation:
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Filed Under: Number Series
Exam Prep: Bank Exams

5 28063
Q:

Select the option that represents the number of squares in the given figure.

 

 

A) 13 B) 15  
C) 14 D) 17  
 
Answer & Explanation Answer: D) 17  

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

0 28046
Q:

Select the number missing from the given series.

 

3, 12, ___, 21612

 

A) 147 B) 149
C) 200 D) 150
 
Answer & Explanation Answer: A) 147

Explanation:
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Filed Under: Number Series
Exam Prep: Bank Exams , CAT

7 28042
Q:

Find the odd word/letters/number from the given alternatives.

 

A) DGI B) JMO
C) PRT D) TWY
 
Answer & Explanation Answer: C) PRT

Explanation:
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Filed Under: Odd Man Out
Exam Prep: Bank Exams

0 28025
Q:

In the following question,select the missing number from the given alternatives.

7, 26, ?, 124, 215, 342

A) 63 B) 65
C) 66 D) 67
 
Answer & Explanation Answer: A) 63

Explanation:
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Filed Under: Odd Man Out
Exam Prep: Bank Exams

0 28021