9 and 21 Average

15 is the average of 9 and 21.

The average of 9 and 21 using simple method provides the step-by-step solution helps to understand the calculation easily. These two input values 9 and 21 can be of any physical quantity but both should have been expressed in the same measurement units to find the average value. Like generating step-by-step soltion for finding average of 9 and 21, users can generate step-by-step solution for any two numbers using this Average Calculator.

9 and 21 average:
= (9 + 21)/2,
= 30/2,
= 15

Hence,
the average of 9 and 21 is equal to 15

where,
9 and 21 physical quantities in same measurement units,
30 is the sum of quantities,
2 is the total number of quantities,
15 is the average of 9 and 21

The step-by-step work shows how to find what is the average of 9 and 21. The solution for 9 and 21 average is same for all the following queries but have to append the measurement units based on the measurement units of physical quantities being measured.

Unitless Measurement:
what is the average of 9 and 21?

Average Speed:
What is the average speed of a bus which covered the distance from point A to B at the speed of 9 mph (miles per hour) and B to C at the speed of 21 mph (miles per hour)?

Average Volume:
The volume of cylinder A is 9 gallons and cylinder B is 21 gallons, what is the average volume of cylinders?

Average Capacity:
A Lincoln theater has the volume of 9 seats and Brooklyn theater has the volume of 21 seats, what is the average capacity of the theaters?

Average Score or Marks:
John has scored 21 marks in mathematics and 9 marks in science in the examinations conducted. What is an average of marks John scored?


Average Solved Example:
what is the average of 9 and 21?

step 1 Address the input parameters and observe what to be found:
Input values:
Quantity A = 9
Quantity B = 21

What to be found:
Find the average of 9 and 21

step 2 Find the sum of quantities 9 and 21.
9 + 21 = 30

step 3 Find how many number of inputs:
The calculation involves two quantities 9 and 21, so the number of quantities is 2.

step 4 To find the average of 9 and 21, divide the sum of quantities 30 by the total number of quantities 2:
= 30/2
= 15
(9 + 21)/2 = 15

Hence,
15 is the average of 9 and 21.