Quantitative Aptitude - Arithmetic Ability Questions

Q:

22 - 33 + 43 - 62 = ?

 

A) 2 B) 3
C) 4 D) 5
 
Answer & Explanation Answer: D) 5

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Q:

If x = 0.139, then what is the value of  4x2 + 4x + 1 ?

 

A) 1.39 B) 1.278
C) 2.139 D) 1.69
 
Answer & Explanation Answer: B) 1.278

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Q:

If x + y + z = 6 and xy + zx + zy = 10, then find the value of x3 + y3 + z3 - 3xyz

 

A) 16 B) 26
C) 36 D) 46
 
Answer & Explanation Answer: C) 36

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Q:

Find the factors of (x2  +  x -  42)

 

A) (x + 14)(x - 3) B) (x + 6)(x - 7)
C) (x - 6)(x + 7) D) (x - 14)(x + 3)
 
Answer & Explanation Answer: C) (x - 6)(x + 7)

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Q:

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

12.5 × 3.2 × 8.8 = ?

A) 358 B) 355
C) 354 D) 356
 
Answer & Explanation Answer:

Explanation:

12.5 × 3.2 × 8.8 = 352

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Q:

Solve the following :

 

 

24 - [25 - 26 - 27 - 28 - 29¯] = ?

 

 

A) -1 B) 1
C) -3 D) -2
 
Answer & Explanation Answer: C) -3

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Q:

If x2 + kx + k = 0 has repeated roots, then the value of k will satisfy :

 

 

A) k<0 or k>4 B) k=4 only
C) 0<k<4 D) k=4 or k=0
 
Answer & Explanation Answer: D) k=4 or k=0

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Q:

The sum of two numbers is 528 and their H.C.F is 33. The number of pairs of numbers satisfying the above condition is

A) 4 B) 6
C) 8 D) 12
 
Answer & Explanation Answer: A) 4

Explanation:

Let the required numbers be 33a and 33b. 

 

Then 33a +33b= 528   =>   a+b = 16.

 

Now, co-primes with sum 16 are (1,15) , (3,13) , (5,11) and (7,9).

 

Therefore, Required numbers are  ( 33 x 1, 33 x 15), (33 x 3, 33 x 13), (33 x 5, 33 x 11), (33 x 7, 33 x 9)

 

The number of such pairs is 4

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