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 Quantitative Aptitude - Arithmetic Ability Questions

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Q:

A student multiplied a number by 6/13 instead of 13/6. What is the percentage error in the calculation?

A) 369.44 percent B) 39.35 percent
C) 184.72 percent D) 78.7 percent
 
Answer & Explanation Answer: D) 78.7 percent

Explanation:
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Filed Under: Percentage
Exam Prep: Bank Exams

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Q:

Find the fourth proportional to 2, 3, 6.

A) 9 B) 10
C) 7 D) 8
 
Answer & Explanation Answer: A) 9

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Filed Under: Ratios and Proportions
Exam Prep: Bank Exams

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Q:

Train A takes 1 hour more than train B to travel a distance of 720 km. Due to engine trouble speed of train B falls by a third, so it takes 3 hours more than Train A to complete the same journey? What is the speed of Train A (in km/hr)?

A) 80 B) 90
C) 60 D) 70
 
Answer & Explanation Answer: A) 80

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Filed Under: Problems on Trains
Exam Prep: Bank Exams

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Q:

Karan purchased one dozen pens for Rs. 120 and sold a pack of 3 pens for Rs.35 each. What is his gain?

A) 16.67% B) 20%
C) 15% D) 33.33%
 
Answer & Explanation Answer: A) 16.67%

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Filed Under: Profit and Loss
Exam Prep: Bank Exams

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Q:

Two taps X and Y can fill a tank in 15 hours and 20 hours respectively. If the two taps are opened at 2 p.m., then at what time (in p.m.) should the tap X be closed to completely fill the tank at exactly 2 a.m.?

A) 8 B) 7
C) 9 D) 10
 
Answer & Explanation Answer: A) 8

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Filed Under: Pipes and Cistern
Exam Prep: Bank Exams

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Q:

The difference of squares of two numbers is 180. The square of the smaller number is 8 times the larger number. Find two numbers.

A) 10 & 12 B) 10 & 18
C) 12 & -18 D) -12 & 18
 
Answer & Explanation Answer: D) -12 & 18

Explanation:

Given, difference of the squares of two numbers is 180.

= k2 - l2 - 180

 

Also, square of the smaller number is 8 times the larger.

= l2 = 8k

 

Thus, k2 - 8a - 180 = 0

k2 – 18k + 10k - 180 = 0

→  k(k - 18) + 10(k – 18) = 0

= (k + 10)(k – 18) = 0

→  k = -10, 18

 

Thus, the other number is

324 - 180 = l2 

 

→ Numbers are 12, 18 or -12, 18.

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

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Q:

If the true discount on sum due 2 years hence at 14% per annum be Rs. 168, the sum due is

A) Rs. 600 B) Rs. 768
C) Rs. 878 D) Rs. 668
 
Answer & Explanation Answer: B) Rs. 768

Explanation:

We know that,

P.W = 100×T.D/R×T

= 100×168/14×2

P.W = 600.

 

Now, required Sum = (P.W. + T.D.)

= Rs. (600 + 168)

= Rs. 768.

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Filed Under: True Discount
Exam Prep: AIEEE , Bank Exams , CAT , GATE
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Q:

By selling a used phone for Rs.7260 Sanjan got 34% less than what it cost him to buy it a few years ago.At what price should Sanjan have sold the phone to gain a profit of 5%?

A) ₹ 11,460 B) ₹ 11,480
C) ₹ 11,440 D) None
 
Answer & Explanation Answer: D) None

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Filed Under: Profit and Loss

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