6500+ Quantitative Aptitude Questions and Answers With Explanation

Q:

The total age of A and B is 12 years more than the total age of B and C. C is how many years younger than A ?

A) 12	B) 13
C) 14	D) 15

Answer & Explanation Answer: A) 12

Explanation:

(A+B) - (B+C) = 12

$\Rightarrow$ A - C = 12.

$\Rightarrow$ C is younger than A by 12 years.

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Filed Under: Problems on Ages

306 62168

Q:

The average of 11 numbers is 10.9. If the average of the first six numbers is 10.5 and that of the last six numbers is 11.4, then the middle number is :

A) 10.5	B) 11.5
C) 12.5	D) 13.5

Answer & Explanation Answer: B) 11.5

Explanation:

Middle numbers = [(10.5 x 6 + 11.4 x 6) - 10.9 x 11] = (131.4 - 119-9) = 11.5.

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Filed Under: Average

103 62137

Q:

Solve : x - 3 = 3x + 7

A) 5	B) -5
C) 1	D) 10/4

Answer & Explanation Answer: B) -5

Explanation:

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Filed Under: Simplification
Exam Prep: Bank Exams

0 61903

Q:

Find the next number in the number series?

1, 4, 12, 32, ?

A) 80	B) 100
C) 192	D) 169

Answer & Explanation Answer: A) 80

Explanation:

Next number of the sequence 1, 4, 12, 32,...

1 = 2 x $2^{0}$

4 = 2 x $2^{1}$

12 = 3 x $2^{2}$

32 = 4 x $2^{3}$

80 = 5 x $2^{4}$ .

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

5 61871

Q:

(51 + 52 + 53 + .........+100) is equal to

Answer

51 + 52 + 53 + ...........+ 100

= (1 + 2 + 3 + .... + 100) - (1 + 2 + 3 + ...... + 50)

= It is in the form of $\frac{n (n + 1)}{2} s e r i e s s u m m a t i o n$

= n1 = 100 , n2 = 50

= $[\frac{100 (100 + 1)}{2}] - [\frac{50 (50 + 1)}{2}]$

= (5050 - 1275) = 3775

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Subject: Numbers Exam Prep: AIEEE , Bank Exams , CAT
Job Role: Bank Clerk , Bank PO

300 61741

Q:

In following number series only one number is wrong. Find out that wrong or odd number in the series?

6, 78, 858, 7722, 54055, 270270

A) 270270	B) 54055
C) 7722	D) 858

Answer & Explanation Answer: B) 54055

Explanation:

Here the given series follows a pattern that, multiplying the number with odd numbers in decreasing order starting with 13. That is,

6 × 13 = 78

65 × 11 = 858

858 × 9 = 7722

7722 × 7 = 54054

54054 × 5 = 270270

Hence, the wrong number is 54055

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

8 61666

Q:

A and B are partners in a business. A contributes 1/4 of the capital for 15 months and B received 2/3 of the profit. For how long B's money was used ?

A) 3 months	B) 6 months
C) 10 months	D) 12 months

Answer & Explanation Answer: C) 10 months

Explanation:

Let the total profit be Rs. z. Then,

B's share = Rs. 2z/3, A's share = Rs. ( z - 2z/3 ) = Rs. z/3.

A : B = z/3 : 2z/3 = 1:2

Let the total capital be Rs, X and suppose B's money was used for x months. Then.

(1(x) / 4 * 15) / (3x) / 4 * y) = 1/2 <=> y = (15 * 2 / 3) = 10 .

Thus, B's money was used for 10 months.

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Filed Under: Partnership

125 61316

Q:

A library has an average of 510 visitors on Sundays and 240 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is :

A) 285	B) 290
C) 297	D) 305

Answer & Explanation Answer: A) 285

Explanation:

Since the month begins with a Sunday, so there will be five Sundays in the month,

Quantitative Aptitude - Arithmetic Ability Questions

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