6500+ Quantitative Aptitude Questions and Answers With Explanation

Q:

The compound interest on rs.30000 at 7% per annum is Rs.4347. The period is

A) 2 years	B) 2.5 years
C) 3 years	D) 4 years

Answer & Explanation Answer: A) 2 years

Explanation:

Amount = Rs.(30000+4347) = Rs.34347

let the time be n years

Then,30000(1+7/100)^n = 34347

(107/100)^n = 34347/30000 = 11449/10000 = (107/100)^2

$\therefore$ n = 2years

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Filed Under: Compound Interest
Exam Prep: GRE

394 97263

Q:

What is the rate of interest p.c.p.a.?

I. An amount doubles itself in 5 years on simple interest.

II. Difference between the compound interest and the simple interest earned on a certain amount in 2 years is Rs. 400.

III. Simple interest earned per annum is Rs. 2000

A) I only	B) II and III only
C) All I, II and III	D) I only or II and III only

Answer & Explanation Answer: D) I only or II and III only

Explanation:

$I . \frac{P * R * 5}{100} = P \Leftrightarrow R = 20$

$I I . P {(1 + \frac{R}{100})}^{2} - P - \frac{P * R * 2}{100} = 400 = > p R^{2} = 4000000$

$I I I . \frac{P * R * 1}{100} = 2000 = > P R = 200000$

$\frac{P R^{2}}{P R} = \frac{4000000}{200000} \Leftrightarrow R = 20$

Thus I only or (II and III) give answer.

Correct answer is (D)

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Filed Under: Compound Interest
Exam Prep: Bank Exams
Job Role: Bank PO

94 97261

Q:

if the price of a book is first decreased by 25% and then increased by 20%, then the net change in the price will be :

A) 10	B) 20
C) 30	D) 40

Answer & Explanation Answer: A) 10

Explanation:

Let the original price be Rs. 100.

New final price = 120 % of (75 % of Rs. 100) = Rs. [(120/100) * (75/100) * 100] = Rs. 90.

Decrease = 10%

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Filed Under: Percentage

511 96923

Q:

311, 230, 294, ?, 281, 256

What will come in place of the question mark (?) in the above number series?

A) 240	B) 245
C) 244	D) 246

Answer & Explanation Answer: B) 245

Explanation:

Given 311 230 294 ? 281 256

311 - (9x9) = 230

230 + (8x8) = 294

294 - (7x7) = 245

245 + (6x6) = 281

281 - (5x5) = 256

Hence, the missing number in the given series is 245.

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Filed Under: Odd Man Out
Exam Prep: GATE , CAT , Bank Exams , AIEEE
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8 96492

Q:

A can do a piece of work in 10 days, B in 15 days. They work together for 5 days, the rest of the work is finished by C in two more days. If they get Rs. 3000 as wages for the whole work, what are the daily wages of A, B and C respectively (in Rs):

A) 200, 250, 300	B) 300, 200, 250
C) 200, 300, 400	D) None of these

Answer & Explanation Answer: B) 300, 200, 250

Explanation:

A's 5 days work = 50%

B's 5 days work = 33.33%

C's 2 days work = 16.66% [100- (50+33.33)]

Ratio of contribution of work of A, B and C = $50 : 33 \frac{1}{3} : 16 \frac{2}{3}$ = 3 : 2 : 1

A's total share = Rs. 1500

B's total share = Rs. 1000

C's total share = Rs. 500

A's one day's earning = Rs.300

B's one day's earning = Rs.200

C's one day's earning = Rs.250

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Filed Under: Time and Work
Exam Prep: CAT , Bank Exams , AIEEE
Job Role: Bank PO , Bank Clerk

596 96290

Q:

What will come in place of the question mark(?) in the following question ?

56% of 870 + 82% of 180 = 32% of 90 + ?

A) 777	B) 666
C) 606	D) 789

Answer & Explanation Answer: C) 606

Explanation:

56% of 870 = 56x870/100 = 487.20

82% of 180 = 82x180/100 = 147.60

32% of 90 = 32x90/100

487.20 + 147.6 - 28.8 = ?

? = 634.8 - 28.8

? = 606.

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Filed Under: Percentage
Exam Prep: AIEEE , Bank Exams , CAT , GATE
Job Role: Bank Clerk , Bank PO

8 96231

Q:

What will come in place of question mark (?) in the following number series?

4, 3, 4, 7, 15, ?

A) 42	B) 44
C) 53	D) 56

Answer & Explanation Answer: B) 44

Explanation:

4 3 4 7 15 ?
×1-1 ×1+1 ×2-1 ×2+1 ×3-1

15x3 - 1 = 45 - 1 = 44

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

8 96016

Q:

The missing number in the Series

114, 131, 165, 216, ?, 369

A) 314	B) 304
C) 294	D) 284

Answer & Explanation Answer: D) 284

Explanation:

114 131 165 216 ? 369

+17 +34 +51 +68 +85

=> The missing number in the given Number series = 216 + 68 = 284.

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

7 94949

Quantitative Aptitude - Arithmetic Ability Questions

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