6500+ Quantitative Aptitude Questions and Answers With Explanation

Q:

If K earns 12% less than L, then how much percent more does L earn than K ?

A) 13.96%	B) 13.63%
C) 13.56%	D) 14.01%

Answer & Explanation Answer: B) 13.63%

Explanation:

Required % is given by

=> $\frac{12}{100 - 12} x 100$

= 1200/88

= 13.636%

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Filed Under: Percentage
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9 3923

Q:

A is 1.5 times efficient than B therefore takes 8 days less than B to complete a work. If A and B work on alternate days and A works on first day, then in how many days the work will be completed?

A) 17	B) 19
C) 19.5	D) 21

Answer & Explanation Answer: B) 19

Explanation:

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Filed Under: Time and Work
Exam Prep: Bank Exams

2 3921

Q:

The difference between compound interest and simple interest on an amount of Rs. 15,000 for 2 years is Rs. 96. What is the rate of interest per annum?

A) 8	B) 10
C) 12	D) 14

Answer & Explanation Answer: A) 8

Explanation:

[15000*(1+r/100)2-15000]-(15000*r*2)/100=96

Rate=8%

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Filed Under: Compound Interest
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0 3908

Q:

A boat goes 4 km upstream and 4 km downstream in 1 hour. The same boat goes 5 km downstream and 3 km upstream in 55 minutes. What is the speed (in km/hr) of oat in still water?

A) 6.5	B) 7.75
C) 9	D) 10.5

Answer & Explanation Answer: C) 9

Explanation:

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Filed Under: Boats and Streams
Exam Prep: Bank Exams

14 3907

Q:

Find the cost of Rs. 6400, 10% stock at 15 discount?

A) 2000	B) 5440
C) 6000	D) 5140

Answer & Explanation Answer: B) 5440

Explanation:

Cost of Rs. 100 stock = Rs. (100-15)

Cost of Rs. 6400 stock = $R s . \frac{85}{100} * 6400$ = Rs. 5440.

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Filed Under: Stocks and Shares

1 3907

Q:

If (4a +7b) (4c-7d) = (4a -7b) (4c +7d, then which one of the following is correct ?

A) a/b = c/d	B) a/d = c/b
C) a/b = d/c	D) none

Answer & Explanation Answer: A) a/b = c/d

Explanation:

(4a+7b)(4c-7d) = (4a-7b)(4c+7d)

(4a+7b)/(4a-7b) = (4c+7d)/(4c-7d)

Using componendo and dividendo

(4a+7b)+(4a-7b) / (4a+7b)-(4a-7b)

= (4c+7d)+(4c-7d) / (4c+7d)-(4c-7d)

Or 8a/14b = 8c/14d

Or a/b = c/d

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Filed Under: Simplification
Exam Prep: Bank Exams

3 3888

Q:

What is the interest rate per annum, if a sum of money invested at compound interest amount to Rs. 2400 in 3 years and in 4 years to Rs. 2,520?

A) 3.5%	B) 4%
C) 5%	D) 6.5%

Answer & Explanation Answer: C) 5%

Explanation:

Let 'R%' be the rate of interest

From the given data,

$\frac{2520}{2400} = \frac{{(1 + \frac{R}{100})}^{4}}{{(1 + \frac{R}{100})}^{3}} \Rightarrow (1 + \frac{R}{100}) = \frac{63}{60} \Rightarrow R = 5$

Hence, the rate of interest R = 5% per annum.

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Filed Under: Compound Interest
Exam Prep: AIEEE , Bank Exams , CAT , GATE
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19 3885

Q:

Calculate the periodic interest rate corresponding to:9.0% compounded quarterly

A) 3.45	B) 2.25
C) 5.25	D) 6.25

Quantitative Aptitude - Arithmetic Ability Questions

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