Exercise Name : Average Of Three Numbers

averageOfNumbers.md

Here is an example of a function

function square(num){
   let squareOfNum = num * num;
   return squareOfNum;
}
let result = square(5);
console.log("The square is " + result);

Write a function named averageOf3 that takes three numbers as parameters and returns the average of the three numbers.

Calculate the average of 30, 25, 35.

Now calculate the average of -5, 10, -26