Aptitude and Reasoning Questions

Q:

Two brother X and Y appeared for an exam. The probability of selection of X is 1/7 and that of B is 2/9. Find the probability that both of them are selected.

A) 1/63 B) 1/14
C) 2/63 D) 1/9
 
Answer & Explanation Answer: C) 2/63

Explanation:

Let A be the event that X is selected and B is the event that Y is selected.

P(A) = 1/7,  P(B) = 2/9.

Let C be the event that both are selected.

P(C) = P(A) × P(B) as A and B are independent events: 

       = (1/7) × (2/9)  = 2/63

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Filed Under: Probability

30 34767
Q:

If you are an engineer ,we have a challenging job for you

Assumptions:

1. We need an engineer

2. You are an engineer

A) Only 1 is true B) Only 2 is true
C) Either 1 or 2 is true D) Neither 1 or 2 is true
 
Answer & Explanation Answer: A) Only 1 is true

Explanation:

Clearly job is is offered to an engineer.This means that he is needed.So,1 is true.The word "If" in the statement 2 makes it false

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Filed Under: Statement and Assumptions
Exam Prep: GRE

3 34756
Q:

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

40 ÷ 8 x 5 + 15 - 2 = 30

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

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

1 34703
Q:

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

 

20 + 12 x 35 - 20 ÷ 10 = 31

 

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

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

0 34700
Q:

A works twice as fast as B.If  B can complete a work in 18 days independently,the number of days  in which A and B can together finish the work is:

A) 4 days B) 6 days
C) 8 days D) 10 days
 
Answer & Explanation Answer: B) 6 days

Explanation:

Ratio of rates of working of A and B =2:1. So, ratio of times taken =1:2

Therefore, A's 1 day's work=1/9 

B's 1 day's work=1/18 

(A+B)'s 1 day's work= 1/9 + 1/18 = 1/6

so, A and B together can finish the work in 6 days

 

 

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Filed Under: Time and Work

101 34692
Q:

The ratio between the speeds of two trains is 7: 8. If the second train runs 400 kms in 4 hours, then the speed of the first train is ?

A) 83.5 km/hr B) 84.5 km/hr
C) 86.5 km/hr D) 87.5 km/hr
 
Answer & Explanation Answer: D) 87.5 km/hr

Explanation:

Let the speeds of two trains be 7X and 8X km/hr.

8x = 400/4

=> x= 12.5 km/hrX=4004=>X=12.5Km/hr

So speed of first train is 12.5*7 = 87.5 km/hr

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Filed Under: Time and Distance

63 34689
Q:

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

 

94 : 36 : : 47 : ?

 

A) 32 B) 28
C) 11 D) 21
 
Answer & Explanation Answer: B) 28

Explanation:
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Filed Under: Analogy
Exam Prep: Bank Exams

0 34638
Q:

Pointing to an old man, Kailash said, "His son is my son's uncle." How is the old man related to Kailash ? 

A) Brother B) Uncle
C) Father D) Grandfather
 
Answer & Explanation Answer: C) Father

Explanation:

Kailash's son's uncle — Kailash's brother. So. the old man's son is Kailash's brother 

i.e., the old man is Kailash's father. 

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Filed Under: Blood Relations

118 34638