As a product of its prime factors: 2*3*3 = 18
(3)(2)(3)=18
Use the definition of "average". Add the numbers together, then divide the result by 3 (since there are 3 numbers).
3 times 3 times 2 equals 18
-3 and 6
2, 3 and 13
1 and 18 2 and 9 3 and 6
Add the numbers together, and then - since there are three numbers - divide the result by 3.
10, just add them all together and divide by how many numbers there are. sometimes you will need a calculator but this time is a definite no
20
the answer is 18
21
You add them together and divide by the amount of numbers. 10+5+3 is 18, /3 is 6