What is the approximate average of these numbers: 9,18 and 31?

60/3 = 20

About 19.

To find the approximate average of a set of numbers, you need to add up all the numbers in the set and then divide that sum by the total number of numbers in the set.

For this problem, the set of numbers is 9, 18, and 31.

First, add up the numbers: 9 + 18 + 31 = 58.

Next, count the total number of numbers in the set, which is 3.

Finally, divide the sum by the total number of numbers: 58 ÷ 3 = 19.3333.

So, the approximate average of the numbers 9, 18, and 31 is approximately 19.3333.