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  Average Question & Answers 

Average

Quantitative aptitude questions are asked in many competitive exams and placement exam. Average is a category in Quantitative Aptitude. Quantitative aptitude questions given here are extremely useful for all kind of competitive exams like Common Aptitude Test (CAT), MAT, GMAT, IBPS Exam, CSAT, CLAT, Bank Competitive Exams, ICET, UPSC Competitive Exams, CLAT, SSC Competitive Exams, SNAP Test, KPSC, XAT, GRE, Defense Competitive Exams, L.I.C/ G. I.C Competitive Exams, Railway Competitive Exam, TNPSC, University Grants Commission (UGC), Career Aptitude Test (IT Companies) and etc., Government Exams etc.

We have a large database of problems on "Average" answered with explanation. These will help students who are preparing for all types of competitive examinations.

The average of runs of a cricket player of 10 innings was 32. How many runs must he make in his next innings so as to increase his average of runs by 4 ?

A) 76B) 79C) 85D) 87

 Answer & ExplanationAnswer: A) 76 

Explanation:

Average = total runs / no.of innings = 32 

So, total = Average x no.of innings = 32 x 10 = 320.

 

Now increase in avg = 4runs. So, new avg = 32+4 = 36runs 

Total runs = new avg x new no. of innings = 36 x 11 = 396 

Runs made in the 11th inning = 396 - 320 = 76

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Subject: Average - Quantitative Aptitude - Arithmetic Ability

1

10 years ago, the average age of a family of 4 members was 24 years. Two children having been born (with age diference of 2 years), the present average age of the family is the same. The present age of the youngest child is :

A) 1B) 2C) 3D) 4

 Answer & ExplanationAnswer: C) 3 

Explanation:

Total age of 4 members, 10 years ago = (24 x 4) years = 96 years.

Total age of 4 members now = [96 + (10 x 4)] years = 136 years.

Total age of 6 members now = (24 x 6) years = 144 years.

Sum of the ages of 2 children = (144 - 136) years = 8 years.

Let the age of the younger child be  years.

Then, age of the elder child = years.

So, 

Age of younger child  =  3 years.

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Subject: Average - Quantitative Aptitude - Arithmetic Ability

6

If the arithmetic mean of seventy-five numbers is calculated, it is 35. if each number is increased by 5, then mean of new numbers is :

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

 Answer & ExplanationAnswer: B) 40 

Explanation:

Let the numbers are 

By Hypothesis , ......(i)

 

Mean of new numbers = 

 By (i) 

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Subject: Average - Quantitative Aptitude - Arithmetic Ability

16

In an examination, a pupil's average marks were 63 per paper. If he had obtained 20 more marks for his Geography paper and 2 more marks for his History paper, his average per paper would have been 65. How many papers were there in the examination ?

A) 8B) 9C) 10D) 11

 Answer & ExplanationAnswer: D) 11 

Explanation:

Let the number of papers be x. Then, 63x + 20 + 2 = 65x or 2x = 22 or x = 11.

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Subject: Average - Quantitative Aptitude - Arithmetic Ability

3

The average age of a husband and his wife was 23 years at the time of their marriage. After  five years they have a one-year old child. The average age of the family now is : 

A) 25B) 23C) 19D) 18

 Answer & ExplanationAnswer: C) 19 

Explanation:

Sum of the present ages of husband, wife and child = (23 * 2 + 5 * 2) + 1 = 57 years.

Required average = (57/3) = 19 years.