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 Quantitative Aptitude - Arithmetic Ability Questions

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Q:

If x = 2+32-3, then what is the value of x2+x-9 ?

A) 0 B) 3√2
C) 3√3 D) 5√3
 
Answer & Explanation Answer: D) 5√3

Explanation:
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Q:

There are 1400 students in a school, 25% of those wear spectacles and 2/7 of those wearing spectacles are boys. How many girls in the school wear spectacles?

A) 250 B) 100
C) 200 D) 300
 
Answer & Explanation Answer: A) 250

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Filed Under: Percentage
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Q:

There were 24 studentsina class. One of them, who was 18 years old, left the class and his place was filled up by a new comer.Ifthe average of the class was thereby lowered by 1 month, the age of new comer is-

A) 14 years B) 15 years
C) 16 years D) 17years
 
Answer & Explanation Answer: C) 16 years

Explanation:

Let the age of new comer be x

Avg age decrease by 1/12 year ⇒24 X 1/12 = 18 –x

⇒x=16 years

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Filed Under: Problems on Ages
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Q:

A sum becomes Rs 1392 in 2 years and Rs 1488 in 3 years at simple interest. What is the rate (in percentage) of interest per annum?

A) 8 B) 10
C) 12 D) 8.5
 
Answer & Explanation Answer: A) 8

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Filed Under: Simple Interest
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Q:

A gun is fired at a distance of 1.7 km from Ram and he hears the sound after 25 seconds. The speed of sound in meter per second is

A) 60 B) 62
C) 64 D) 68
 
Answer & Explanation Answer: D) 68

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Filed Under: Time and Distance
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Q:

If tan x = 1, 0 < x < 90, then what is the value of 2 sin x cos x?

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

Explanation:

tan x = 1

then x = 45

2sin x. cos x = 2× 1/√2 x 1/√2 = 1

an x = 1
then
x = 45
o
2sin x. cos x =
2
×
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Q:

What is the reflection of the point (5, -2) in the line y = -1?

A) (-7 , -2) B) (-5 , 0)
C) (5 , 0) D) (-7 , 2)
 
Answer & Explanation Answer: C) (5 , 0)

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Q:

If cosec θ + sinθ = 5/2 then the value of cosecθ - sinθ is

A) -3/2 B) 3/2
C) −√3/2 D) √3/2
 
Answer & Explanation Answer: B) 3/2

Explanation:
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