6500+ Quantitative Aptitude Questions and Answers With Explanation

Q:

A man buys oranges at Rs 5 a dozen and an equal number at Rs 4 a dozen. He sells them at Rs 5.50 a dozen and makes a profit of Rs 50. How many oranges does he buy?

A) 30 dozens	B) 40 dozens
C) 50 dozens	D) 60 dozens

Answer & Explanation Answer: C) 50 dozens

Explanation:

Cost Price of 2 dozen oranges Rs. (5 + 4) = Rs. 9.
Sell price of 2 dozen oranges = Rs. 11.
If profit is Rs 2, oranges bought = 2 dozen.
If profit is Rs. 50, oranges bought = (2/2) * 50 dozens = 50 dozens.

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Filed Under: Profit and Loss

173 37145

Q:

A boy multiplied 987 by a certain number and obtained 559981 as his answer. If in the answer both 98 are wrong and the other digits are correct , then the correct answer would be :

A) 553681	B) 555181
C) 555681	D) 556581

Answer & Explanation Answer: C) 555681

Explanation:

987 = 3 * 7 * 47.
So, the required number must be divisible by each one of 3, 7, 47
553681 => (Sum of digits = 28, not divisible by 3)
555181 => (Sum of digits = 25, not divisible by 3)
555681 is divisible by each one of 3, 7, 47.

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Filed Under: Numbers

61 37073

Q:

Find the average of first 20 multiples of 9.

A) 94.8	B) 94.7
C) 94.6	D) 94.5

Answer & Explanation Answer: D) 94.5

Explanation:

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Filed Under: Average
Exam Prep: Bank Exams

1 36971

Q:

In how many years will a sum of Rs.800 at 10% per annum compounded semi annually become Rs.926.10

A) 1.5	B) 2.5
C) 3.5	D) 4.5

Answer & Explanation Answer: A) 1.5

Explanation:

Let the time be 'n' years, Then

$800 \times {(1 + \frac{5}{100})}^{2} n = 926.10 < = > {(1 + \frac{5}{100})}^{2} n = \frac{9261}{8000} < = > {(\frac{21}{20})}^{2} n = {(\frac{21}{10})}^{3}$

n = 3/2 or n= 1 $\frac{1}{2}$ Years

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Filed Under: Simple Interest
Exam Prep: GRE

125 36960

Q:

x = y - (50/y), where x and y are both > 0

If the value of y is doubled in the equation above, the value of x will

A) decrease	B) stay the same
C) increase four fold	D) increase to more than double

Answer & Explanation Answer: D) increase to more than double

Explanation:

The best approach is to pick a number that satisfies the rules that x and y are greater than 0. So for example you could choose 25 for y.

The value of x before doubling is then 25 - 50/25 = 23

The value after doubling y will be 50 - 50/50 = 49, which is more than double.

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Filed Under: Numbers
Exam Prep: GRE

5 36959

Q:

Which of the following fractions is greater than 3 /4 and less than 5 / 6 ?

A) 3 / 5	B) 4 / 5
C) 7 / 5	D) 9 / 5

Answer & Explanation Answer: B) 4 / 5

Explanation:

3 /4 = 0.75, 5/6 = 0.833, 1/2 = .5, 2/3 = 0.66, 4/5 = 0.8, 9/10 = 0.9.

clearly 0.8 lies between 0.75 and .833.

4/5 lies between 3/4 and 5/6..

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Filed Under: Decimal Fractions

56 36954

Q:

How long will a boy take to run round a square field of side 35 meters, If he runs at the rate of 9 km/hr?

A) 50 sec	B) 52 sec
C) 54 sec	D) 56 sec

Answer & Explanation Answer: D) 56 sec

Explanation:

Speed = 9 km/hr = 9 x (5/18) m/sec = 5/2 m/sec

Distance = (35 x 4) m = 140 m.

Time taken = 140 x (2/5) sec= 56 sec

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Filed Under: Time and Distance

134 36927

Q:

If the area of a semi-circle is 693 $c m^{2}$ , then find its radius (in cm).

A) 42	B) 27
C) 21	D) 54

Quantitative Aptitude - Arithmetic Ability Questions

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