Introduction
Average is a commonly used mathematical concept that helps find a representative value for a group of numbers. Average questions frequently appear in aptitude tests, competitive exams, and everyday calculations.
Question 1
Find the average of:
10, 20, 30, 40, 50
A) 20
B) 25
C) 30
D) 35
Answer
C) 30
Explanation
Sum = 10 + 20 + 30 + 40 + 50
= 150
Average = Sum ÷ Number of Values
= 150 ÷ 5
= 30
Question 2
The marks obtained by a student in five tests are:
60, 70, 80, 90, 100
Find the average marks.
A) 75
B) 80
C) 85
D) 90
Answer
B) 80
Explanation
Total Marks
= 60 + 70 + 80 + 90 + 100
= 400
Average
= 400 ÷ 5
= 80
Question 3
Find the average of:
12, 18, 24, 30
A) 18
B) 20
C) 21
D) 24
Answer
C) 21
Explanation
Sum
= 12 + 18 + 24 + 30
= 84
Average
= 84 ÷ 4
= 21
Question 4
The average age of 4 friends is 25 years.
What is the total age of all friends?
A) 75
B) 90
C) 100
D) 125
Answer
C) 100
Explanation
Total Age
= Average × Number of Persons
= 25 × 4
= 100
Question 5
The average of 6 numbers is 15.
Find their total sum.
A) 75
B) 80
C) 85
D) 90
Answer
D) 90
Explanation
Sum
= Average × Number of Values
= 15 × 6
= 90
Key Learning
Important Formulas:
Average = Sum of Values ÷ Number of Values
Sum of Values = Average × Number of Values
These two formulas solve most average problems.
Practice Tip
When the average and number of items are given, first find the total sum. This often makes solving aptitude questions much easier.
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