Quantitative Aptitude - Arithmetic Ability Questions

Q:

What is the fraction which, when taken away from 1/2, gives 2/3?

A) 1/3 B) -1/3
C) -1/6 D) 1/6
 
Answer & Explanation Answer: C) -1/6

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Q:

Which is the correct ascending order of the given numbers?

A) 1/2, 2/3, 7/12 B) 7/12, 2/3, 1/2
C) 1/2, 7/12, 2/3 D) 2/3, 1/2, 7/12
 
Answer & Explanation Answer: C) 1/2, 7/12, 2/3

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Q:

Which of the following numbers is a prime number?

A) 161 B) 181
C) 121 D) 141
 
Answer & Explanation Answer: B) 181

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Q:

____ are twin prime numbers.

A) (4,9) B) (2,3)
C) (4,6) D) (3,5)
 
Answer & Explanation Answer: D) (3,5)

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Q:

In the following question, four number pairs are given. The number on left side of (–) is related to the number on the right side of (–) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the 

 

A)   21 – 42     B)   23 – 46    
C)    31 – 62     D)   33 – 69  
 
Answer & Explanation Answer: D)   33 – 69  

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Q:

The smallest number that is completely divisibly by 6, 8, 12 and 16 is

A) 48 B) 24
C) 64 D) 80
 
Answer & Explanation Answer: A) 48

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Q:

How much does one need to add to 4/5 to obtain 5/4?

A) 16/20 B) 1/-1
C) 1.25/0.8 D) 9/20
 
Answer & Explanation Answer: D) 9/20

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Q:

The angle of elevation of a ladder leaning against a wall is 60 deg and the foot of the ladder is 4.2 m away from the wall. The length of the ladder is

A) 9.2 m B) 11.4 m
C) 8.5 m D) 13.5 m
 
Answer & Explanation Answer: A) 9.2 m

Explanation:

Let AB be the wall and BC be the ladder. Then, ACB=60°   and AC=4.6 m.  AC/BC = cos 60°  =  1/2     BC = 2×AC =(2×4.6)m = 9.2 m

 

 

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