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Problems on Average
Average - Aptitude
1. Find the average of all prime numbers between 10 and 30.
x
Option: C
Explanation
Totally there are 6 prime numbers between 10 & 30
they are 11, 13, 17, 19, 23 & 29
Average =
2. Find the average of first 20 natural numbers.
x
Option: A
Explanation
Sum of first n natural numbers =
Sum of first 20 natural numbers =
Average =
3. Find the average of first 20 multiples of 5.
x
Option: B
Explanation
Sum of first n natural numbers =
Sum of first 20 natural numbers =
Average =
Average of first 20 multiples of 5 = 5 * 10.5 = 52.5
4. The average of four consecutive even numbers is 27. Find the largest of these numbers.
x
Option: B
Explanation
Assume the numbers as x, x + 2, x + 4 & x + 6
Average of that 4 numbers =
x + 3 = 27 = 24
Largest number = (x + 6) = 24 + 6 = 30
5. There are two sections A and B of a class, consisting of 40 and 36 students respectively. If the average weight of section A is 40 kg and that of section B is 45 kg. Find the average weight of the whole class.
x
Option: C
Explanation
Total number of students = 40 + 36 = 76 Students
Total weight of students = (40 * 40) + (36 * 45) = 3220 kg
Average weight of whole class =
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