The mean of 8 and another number is 13. what is the other number?

The second number is 18.

Given to us,

First number, ,

Mean of two numbers,

Let us assume second number as x,

Also, we know mean is the arithmetic average of given numbers.

Hence, the second number is 18.

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Work Shown:

x = the unknown number

The mean of 8 and the unknown number is 13. This indicates we add up 8 and x, then divide by 2, and we'll get 13.

(8+x)/2 = 13

8+x = 2*13 multiply both sides by 2

8+x = 26

x = 26-8 subtract 8 from both sides

x = 18

As a check,

(8+18)/2 = 26/2 = 13

This shows the mean of {8,18} is 13.