Quantitative Aptitude - Arithmetic Ability Questions

Q:

ΔPQR is right angled at Q. If m∠R=300, then find the value of (cosP - 1/3).

 

A) 1/6 B)  (2√2-1)/√2
C)  -1/√3 D)  (√3-4)/2√3
 
Answer & Explanation Answer: A) 1/6

Explanation:
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Q:

In the given figure, if  QR/XY = 14/9 and PY = 18 cm, then what is the value (in cm) of PQ?

 

 

A) 28 B) 18
C) 21 D) 24
 
Answer & Explanation Answer: A) 28

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Q:

Find out the wrong number in the following series:

5, 15, 30, 80, 180, 540, 1080

A) 540 B) 180
C) 30 D) 80
 
Answer & Explanation Answer: D) 80

Explanation:

There should be 90 instead of 80
so we can have a series
5, 5x3, 15x2, 30x3, 90x2, 180x3, 540x2 and 1080x3 and so on...

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Q:

In the following question, correct the equation by interchanging two signs.

4 x 3 – 6 ÷ 2 + 7 = 8

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

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Q:

Find the odd man out?

12, 48, 168, 502, 1260

A) 48 B) 168
C) 502 D) 1260
 
Answer & Explanation Answer: C) 502

Explanation:

The given series is 12, 48, 168, 502, 1260

12

12 x 4 = 48

48 x 3.5 = 168

168 x 3 = 504

504 x 2.5 = 1260

 

Hence, the odd man out in the given series is 502.

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Q:

Pick the odd man out of the folowing number sequence?

123 112 133 112 143

A) 143 B) 122
C) 133 D) 112
 
Answer & Explanation Answer: B) 122

Explanation:

Here the given series is 123 112 133 112 143

It follows a pattern that,

123

123 - 11 = 112

112 + 21 = 133

133 - 31 = 102 (not 122)

102 + 41 = 143

 

Hence, the odd man in the given number sequence is 122 instead of 102.

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Q:

If 19x2 = 1002 - 902, then find the value of x.

 

A) 10 B) 9
C) 11 D) 12
 
Answer & Explanation Answer: A) 10

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Q:

What is the value of (2 - tan60°) ?

 

A) -1/√3 B) (√3-4)/2√3  
C) -1/2   D) 2-√3
 
Answer & Explanation Answer: D) 2-√3

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