6500+ Quantitative Aptitude Questions and Answers With Explanation

Q:

What is the value of (sin45 - √3) ?

A) (1-√6)/√2	B) (4-√3)/2√3
C) -1/2√3	D) (2-√3)/2√3

Answer & Explanation Answer: A) (1-√6)/√2

Explanation:

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Q:

Simplify : $\frac{5}{28} \div \frac{28}{35} \div \frac{20}{112}$

A) 4/5	B) 5/4
C) 4/7	D) 7/4

Answer & Explanation Answer: B) 5/4

Explanation:

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Q:

A,B,C together can do a piece of work in 10 days.All the three started workingat it together and after 4 days,A left.Then,B and C together completed the work in 10 more days.In how many days can complete a work alone ?

A) 25	B) 24
C) 23	D) 21

Answer & Explanation Answer: A) 25

Explanation:

(A+B+C) do 1 work in 10 days.

So (A+B+C)'s 1 day work=1/10 and as they work together for 4 days so workdone by them in 4 days=4/10=2/5

Remaining work=1-2/5=3/5

(B+C) take 10 more days to complete 3/5 work. So( B+C)'s 1 day work=3/50

Now A'S 1 day work=(A+B+C)'s 1 day work - (B+C)'s 1 day work=1/10-3/50=1/25

A does 1/25 work in in 1 day

Therefore 1 work in 25 days.

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Q:

Simplify : ${(27)}^{\frac{- 2}{3}}$

A) 1/18	B) 9
C) 1/9	D) 18

Answer & Explanation Answer: C) 1/9

Explanation:

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Q:

3, 11, 80, 291, 803

Find the odd man out of the number series?

A) 11	B) 803
C) 80	D) 291

Answer & Explanation Answer: C) 80

Explanation:

The given number series is 3, 11, 80, 291, 803

$3 3 + 2^{3} = 3 + 8 = 11 11 + 4^{3} = 11 + 64 = 75 (not 80) 75 + 6^{3} = 75 + 216 = 291 291 + 8^{3} = 291 + 512 = 803$

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Q:

Select the option that can replace the question mark (?) in the following equation.

$\frac{{(0.2)}^{3} - {(0.1)}^{3}}{{(0.2 + 0.1)}^{2}}$

A) 1/18	B) 3/40
C) -7/90	D) 7/90

Answer & Explanation Answer: D) 7/90

Explanation:

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Q:

Find the wrong number in the given number series?

5, 8, 40, 90, 664

A) 8	B) 40
C) 90	D) 664

Answer & Explanation Answer: B) 40

Explanation:

The given number series is 5, 8, 40, 90, 664

5

5 - 1 x 2 = 8

8 - 3 x 4 = 20 (NOT 40)

20 - 5 x 6 = 90

90 - 7 x 8 = 664

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Q:

Find the next number in the given number series?

11, 5.5, 10, 6.5, 9, ?

A) 6.5	B) 7.5
C) 8.5	D) 10.5

Answer & Explanation Answer: B) 7.5

Explanation:

The given number series follows a pattern that

11

11 - 5.5 = 5.5

5.5 + 4.5 = 10

10 - 3.5 = 6.5

6.5 + 2.5 = 9

9 - 1.5 = 7.5

Hence, the next number in the given number series is 7.5.

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Quantitative Aptitude - Arithmetic Ability Questions

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