Question

The average of three numbers is `5`. If the sum of two of the numbers is `6`, what is the third number?

Answer 1

The third number is `9`

Explanation:

If the average of `3` numbers is `5`, then the sum has to be `3xx5 = 15`

Call the missing number `x`.

Then `x +6 = 15`

`x = 15-6`

`x=9`