6500+ Quantitative Aptitude Questions and Answers With Explanation

Q:

In an examination, a student scores 4 marks for every correct answer and loses 1 mark for every wrong answer. If he attempts all 60 questions and secures 130 marks, the no of questions he attempts correctly is :

A) 35	B) 38
C) 40	D) 42

Answer & Explanation Answer: B) 38

Explanation:

Let the number of correct answers be X.

Number of incorrect answers = (60 – X).

4x – (60 – x) = 130

=> 5x = 190

=> x = 38

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Filed Under: Simplification

266 88535

Q:

Solve the following :

196 - 19.6 - 1.96 - 0.196 = ?

A) 173.254	B) 173.234
C) 174.234	D) 174.244

Answer & Explanation Answer: D) 174.244

Explanation:

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Exam Prep: Bank Exams

0 88372

Q:

If √21 = 4.58, then the simplified value of $(8 \sqrt{\frac{3}{7}} - 3 \sqrt{\frac{7}{3}})$

A) 0.474	B) 0.752
C) 0.655	D) 1

Answer & Explanation Answer: C) 0.655

Explanation:

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Exam Prep: Bank Exams

0 88204

Q:

8, 14, 24, 60, 180

Find the odd man out of the series?

A) 180	B) 60
C) 24	D) 14

Answer & Explanation Answer: D) 14

Explanation:

The given series is 8, 14, 24, 60, 180

8

8 x 1.5 = 12 (NOT 14)

12 x 2 = 24

24 x 2.5 = 60

60 x 3 = 180

Hence, the odd man in the given series is 12.

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Filed Under: Odd Man Out
Exam Prep: AIEEE , Bank Exams , CAT , GATE
Job Role: Analyst , Bank Clerk , Bank PO

4 87566

Q:

Find the next number in the following number series?

410, 409, 413, 404, ?

A) 412	B) 415
C) 418	D) 420

Answer & Explanation Answer: D) 420

Explanation:

The given number series 410, 409, 413, 404, ? , follows a pattern that

410

$410 - 1^{3} = 409 409 + 2^{2} = 413 413 - 3^{3} = 404 404 + 4^{2} = 420$

Hence, the next number in the given series is 420.

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Filed Under: Odd Man Out
Exam Prep: AIEEE , Bank Exams , CAT , GATE
Job Role: Analyst , Bank Clerk , Bank PO , Database Administration , IT Trainer

4 87406

Q:

If each edge of a cube is increased by 50%, find the percentage increase in Its surface area

A) 125%	B) 150%
C) 175%	D) 110%

Answer & Explanation Answer: A) 125%

Explanation:

Let the edge = a cm

So increase by 50 % = a + a/2 = 3a/2

Total surface Area of original cube = $6 a^{2}$

TSA of new cube = $6 {(\frac{3 a}{2})}^{2}$ = $6 (\frac{9 a^{2}}{4})$ = $13.5 a^{2}$

Increase in area = $13.5 a^{2} - 6 a^{2}$ = $7.5 a^{2}$

$7.5 a^{2}$ Increase % = $\frac{7.5 a^{2}}{6 a^{2}} \times 100$ = 125%

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Filed Under: Volume and Surface Area

484 87377

Q:

If $3 x^{2} + kx + k = 0$ has no solution, then the value of k will satisfy

A) k > -12	B) k > 12
C) k < 12	D) 0 < k < 12

Answer & Explanation Answer: D) 0 < k < 12

Explanation:

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Q:

A, B, C started a business with their investments in the ratio 1:3 :5. After 4 months, A invested the same amount as before and B as well as C withdrew half of their investments. The ratio of their profits at the end of the year is :

A) 1 : 2 : 3	B) 3 : 4 : 15
C) 3 : 5 : 10	D) 5 : 6 : 10

Answer & Explanation Answer: D) 5 : 6 : 10

Explanation:

Let their initial investments be x, 3x and 5x respectively. Then,

A:B:C = (x*4+2x*8) : (3x*4+(3x/2)*8) : (5x*4+(5x/2)*8)

20x : 24x : 40x = 5 : 6 : 10

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Filed Under: Partnership

207 86484

Quantitative Aptitude - Arithmetic Ability Questions

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