Quantitative Aptitude - Arithmetic Ability Questions

Q:

The average marks obtained by a group of 16 students was 20. One student left the group as a result of which the average of the remaining students rose to 21. But another student joined, as a result of which the average marks of the group dropped a bit and became 20.5. What was the average marks obtained by the student who left and the one who joined?

A) 10 B) 11
C) 8 D) 9
 
Answer & Explanation Answer: D) 9

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Filed Under: Average
Exam Prep: Bank Exams

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Q:

The average of first 20 multiples of 12 is

A) 124 B) 120
C) 126 D) 130
 
Answer & Explanation Answer: C) 126

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Filed Under: Problems on Numbers
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Q:

If the diameter of a hemisphere is 21 cm, then what is the volume (in cub.cm) of hemisphere?

A) 2810 B) 1250.5
C) 1725.25 D) 2425.5
 
Answer & Explanation Answer: D) 2425.5

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Filed Under: Volume and Surface Area
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Q:

The diameter of a circle is equal to the side of the square. What is the area of the square if the area of the circle is 49π sq cm?

A) 196 sq cm B) 154 sq cm
C) 124 sq cm D) 98 sq cm
 
Answer & Explanation Answer: A) 196 sq cm

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Filed Under: Volume and Surface Area
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Q:

The marked price of an article is Rs 1200 and retailer gets a discount of 25%. If he sells that article for Rs 1200, then what is the profit percentage of retailer?

A) 33.33 B) 25
C) 37.5 D) 16.66
 
Answer & Explanation Answer: A) 33.33

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Filed Under: Profit and Loss
Exam Prep: Bank Exams

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Q:

If Rajan purchase 21 pens for Rs 20 and sell all the pens at the rate of 20 pens for Rs 21, then what will be the profit percentage?

A) 12.5 B) 13.33
C) 10.25 D) 16.66
 
Answer & Explanation Answer: C) 10.25

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Filed Under: Profit and Loss
Exam Prep: Bank Exams

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Q:

The age of A is three times the age of B. What is the ratio of the age of B to the age of A?

A) 1:3 B) 1:4
C) 1:2 D) 3:1
 
Answer & Explanation Answer: A) 1:3

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Filed Under: Problems on Ages
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Q:

If x + [1/(x + 7)] = 0, then what is the value of x – [1/(x + 7)]?

A) 3√5 B) 3√5 – 7
C) 3√5 + 7 D) 8
 
Answer & Explanation Answer: B) 3√5 – 7

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