6500+ Quantitative Aptitude Questions and Answers With Explanation

Q:

If 1 + (1/2) + (1/3) + ... + (1/20) = k, then what is the value of (1/4) + (1/6) + (1/8) + ... + (1/40)?

A) k/2	B) 2k
C) (k – 1)/2	D) (k + 1)/2

Answer & Explanation Answer: C) (k – 1)/2

Explanation:

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Q:

A shopkeeper by selling 20 Timex watches, earns a profit equal to the selling price of 4 Timex watches. His profit percentage is

A) 20 percent	B) 25 percent
C) 30 percent	D) 50 percent

Answer & Explanation Answer: B) 25 percent

Explanation:

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Q:

If the least common multiple of two numbers, 1728 and K is 5184, then how many values of K are possible?

A) 11	B) 8
C) 6	D) 7

Answer & Explanation Answer: D) 7

Explanation:

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Q:

Giving two successive discounts of 40% is equal to giving one discount of ________%.

A) 80	B) 96
C) 64	D) 72

Answer & Explanation Answer: C) 64

Explanation:

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Q:

1.1 + 12.12 + 123.123 = ?

A) 134.343	B) 133.433
C) 132.123	D) 136.343

Answer & Explanation Answer: D) 136.343

Explanation:

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Q:

$\cos^{3} A$ is equal to

A) cos3A - 3sin2cosA	B) cos3A + 4sin2cosA
C) cos3A + 3sin2cosA	D) cos3A - 4sin2cosA

Answer & Explanation Answer: C) cos3A + 3sin2cosA

Explanation:

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Q:

3/8 as a decimal

A) 1.375	B) 2.375
C) 0.375	D) 3.75

Answer & Explanation Answer: C) 0.375

Explanation:

Expressing 3/8 as a decimal fraction:

We can convert 3/8 into a decimal fraction by just dividing 3 by 8 or making 3 into 8 parts.

Then, it is 3/8 = 0.375 as a decimal fraction.

Other Method::

3/8 as a Decimal :

In this we should convert the denominator into 10, 100, 1000, 10000, 100000,... to make it simple.

Now to make 8 into 1000, we multiply numerator and denominator with 125

=> ( $\frac{3 x 125}{8 x 125} = \frac{375}{1000} = 0.375$

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Filed Under: Decimal Fractions
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Q:

A race has three parts. The speed and time required to complete the individual parts for a runner is displayed on the following chart:

Part I Part II Part III

Speed (kmph) 9 8 7.5

Time (minutes) 50 80 100

What is the average speed of this runner?

A) 8.17 kmph	B) 8.00 kmph
C) 7.80 kmph	D) 7.77 kmph

Quantitative Aptitude - Arithmetic Ability Questions

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